Question: When did Hurricane Maria make landfall on the island that the immigration encouraged by the Royal Decree of Grace led to?

full_context: Document 1: Hurricane Maria: The storm made landfall on Puerto Rico on Wednesday, September 20 as a Category 4 hurricane with winds of 155 mph. A sustained wind of 64 mph (103 km / h) with a gust to 113 mph (182 km / h) was reported in San Juan, Puerto Rico, immediately prior to the hurricane making landfall on the island. After landfall, wind gusts of 109 mph (175 km / h) were reported at Yabucoa Harbor and 118 mph (190 km / h) at Camp Santiago. In addition, very heavy rainfall occurred throughout the territory, peaking at 37.9 in (962.7 mm) in Caguas. Widespread flooding affected San Juan, waist - deep in some areas, and numerous structures lost their roof. The coastal La Perla neighborhood of San Juan was largely destroyed. Cataño saw extensive damage, with the Juana Matos neighborhood estimated to be 80 percent destroyed. The primary airport in San Juan, the Luis Muñoz Marín International Airport, was slated to reopen on September 22.
Document 2: Hurricane Sandy: After Sandy exited Cuba, the structure became disorganized, and it turned to the north - northwest over the Bahamas. By October 27, Sandy was no longer fully tropical, and despite strong shear, it maintained convection due to influence from an approaching trough; the same trough turned the hurricane to the northeast. After briefly weakening to a tropical storm, Sandy re-intensified into a hurricane, and on October 28 an eye began redeveloping. The storm moved around an upper - level low over the eastern United States and also to the southwest of a ridge over Atlantic Canada, turning it to the northwest. Sandy briefly re-intensified to Category 2 intensity on the morning of October 29, around which time it had a wind diameter of over 1,150 miles (1,850 km), and a central pressure of 943 mb, which set records for many cities across the Northeastern United States for the lowest pressures ever observed. The convection diminished while the hurricane accelerated toward the New Jersey coast, and the hurricane was no longer tropical by 2100 UTC on October 29. About 2 / hours later, Sandy made landfall near Brigantine, New Jersey, with winds of 80 mph (130 km / h). During the next four days, Sandy's remnants drifted northward and then northeastward over Ontario, before merging with another low pressure area over Eastern Canada on November 2.
Document 3: Typhoon Mangkhut: Substantial intensification ensued on September 11, as Mangkhut traversed the Philippine Sea. A second bout of rapid intensification took place as the storm consolidated significantly; a well-defined 39 km (24 mi) eye became established during this time. The JTWC analyzed Mangkhut to have reached Category 5-equivalent intensity by 12:00 UTC, an intensity it would maintain for nearly four days. The JMA assessed that the typhoon's central pressure bottomed out at 18:00 UTC, with 10-minute sustained winds of 205 km/h (125 mph) and a central minimum pressure of 905 hPa (mbar; 26.73 inHg). The JTWC noted additional strengthening on September 12, and assessed Mangkhut to have reached its peak intensity at 18:00 UTC, with one-minute sustained winds of 285 km/h (180 mph). The typhoon made landfall in Baggao, Cagayan at 2:00 a.m. PST on September 15 (18:00 UTC on September 14), as a Category 5-equivalent super typhoon, with 10-minute sustained winds of 205 km/h (125 mph) and 1-minute sustained winds of 270 km/h (165 mph). This made Mangkhut the strongest storm to strike the island of Luzon since Typhoon Megi in 2010, and the strongest nationwide since Typhoon Haiyan in 2013.Traversing the mountains of Luzon weakened Mangkhut before it emerged over the South China Sea on September 15. The typhoon subsequently made landfall again on the Taishan coast of Jiangmen, Guangdong, China, at 5 p.m. Beijing Time (09:00 UTC) on September 16, with 2-minute sustained winds of 45 m/s (160 km/h).Following landfall, Mangkhut quickly weakened while moving westward. Late on September 17, Mangkhut dissipated over Guangxi, China.
Document 4: Hurricane Charley: After crossing Cuba near Menelao Mora, Hurricane Charley accelerated to the north - northeast, toward the southwest coast of Florida in response to the approach of an unseasonal mid-tropospheric trough. Charley passed over the Dry Tortugas at 1200 UTC on August 13, with maximum winds of about 110 mph (180 km / h). The strike occurred only 22 hours after Tropical Storm Bonnie made landfall on St. Vincent Island, marking the first time two tropical cyclones hit the same state within a 24 - hour period. Then Charley rapidly intensified, strengthening from a 110 mph (180 km / h) hurricane with a minimum central barometric pressure of 965 mbar (hPa; 28.50 inHg) to a 145 mph (233 km / h) hurricane with a pressure of 947 mbar (hPa; 27.96 inHg) in just three hours. It continued to strengthen as it turned more to the northeast, and made landfall near the island of Cayo Costa, Florida as a 150 mph (240 km / h) Category 4 hurricane with a pressure of 941 mbar (hPa; 27.79 inHg) at approximately 1945 UTC on August 13. An hour later, the hurricane struck Punta Gorda as a 145 mph (233 km / h) storm and then passed up through Port Charlotte. However, the eye had shrunk before landfall, limiting the most powerful winds to an area within 7 mi (11 km) of the center.
Document 5: History of Puerto Rico: Located in the northeastern Caribbean, Puerto Rico formed a key part of the Spanish Empire from the early years of the exploration, conquest and colonization of the New World. The island was a major military post during many wars between Spain and other European powers for control of the region in the 16th, 17th and 18th centuries. The smallest of the Greater Antilles, Puerto Rico was a stepping - stone in the passage from Europe to Cuba, Mexico, Central America, and the northern territories of South America. Throughout most of the 19th century until the conclusion of the Spanish -- American War, Puerto Rico and Cuba were the last two Spanish colonies in the New World; they served as Spain's final outposts in a strategy to regain control of the American continents. Realizing that it was in danger of losing its two remaining Caribbean territories, the Spanish Crown revived the Royal Decree of Graces of 1815. The decree was printed in Spanish, English and French in order to attract Europeans, with the hope that the independence movements would lose their popularity and strength with the arrival of new settlers. Free land was offered to those who wanted to populate the islands on the condition that they swear their loyalty to the Spanish Crown and allegiance to the Roman Catholic Church.
Document 6: Hurricane Maria: The hurricane made its closest approach to St. Croix around 05: 00 UTC on September 20, passing within 20 mi (30 km) of the island; the storm's outer eyewall lashed the island while the more violent inner eye remained offshore. Hours later, around 08: 00 UTC, the outer eyewall struck Vieques, an island off the eastern coast of Puerto Rico. By this time, the outer eye became dominant as the inner one decayed, and the eyewall replacement cycle caused Maria to weaken to Category 4 strength. Maria made landfall just south of Yabucoa, Puerto Rico, around 10: 15 UTC with sustained winds of 155 mph (250 km / h), making it the strongest to hit the island since the 1928 San Felipe Segundo hurricane. Maria maintained a general west - northwest course across Puerto Rico, emerging over the Atlantic Ocean shortly before 18: 00 UTC. Interaction with the mountainous terrain resulted in substantial weakening; sustained winds fell to 110 mph (175 km / h) and the central pressure rose to 957 mbars (hPa; 28.26 inHg). With favorable environmental conditions, Maria steadily reorganized as it moved away from Puerto Rico. A large eye, 45 mi (75 km) wide, developed with deep convection blossoming around it. Early on September 21, the system regained Category 3 intensity.
Document 7: Puerto Rico: Originally populated by the indigenous Taíno people, the island was claimed in 1493 by Christopher Columbus for the Crown of Castile during his second voyage. Later it endured invasion attempts from the French, Dutch, and British. Four centuries of Spanish colonial government transformed the island's ethnic, cultural and physical landscapes primarily with waves of African slaves, Canarian, and Andalusian settlers. In the Spanish imperial imagination, Puerto Rico played a secondary, but strategic role when compared to wealthier colonies like Peru and the mainland parts of New Spain. Spain's distant administrative control continued up to the end of the 19th century, helping to produce a distinctive creole Hispanic culture and language that combined elements from the Native Americans, Africans, and Iberians. In 1898, following the Spanish -- American War, the United States acquired Puerto Rico under the terms of the Treaty of Paris.
Document 8: Puerto Rico: Originally populated by the indigenous Taíno people, the island was claimed in 1493 by Christopher Columbus for Spain during his second voyage. Later it endured invasion attempts from the French, Dutch, and British. Four centuries of Spanish colonial government influenced the island's cultural landscapes with waves of African slaves, Canarian, and Andalusian settlers. In the Spanish Empire, Puerto Rico played a secondary, but strategic role when compared to wealthier colonies like Peru and the mainland parts of New Spain. Spain's distant administrative control continued up to the end of the 19th century, helping to produce a distinctive creole Hispanic culture and language that combined elements from the Native Americans, Africans, and Iberians. In 1898, following the Spanish -- American War, the United States acquired Puerto Rico under the terms of the Treaty of Paris. The treaty took effect on April 11, 1899.
Document 9: Puerto Rico: Originally populated by the indigenous Taíno people, the island was claimed in 1493 by Christopher Columbus for the Crown of Castile during his second voyage. Later it endured invasion attempts from the French, Dutch, and British. Four centuries of Spanish colonial government transformed the island's ethnic, cultural and physical landscapes primarily with waves of African slaves, and Canarian, and Andalusian settlers. In the Spanish imperial imagination, Puerto Rico played a secondary, but strategic role when compared to wealthier colonies like Peru and the mainland parts of New Spain. Spain's distant administrative control continued up to the end of the 19th century, helping to produce a distinctive creole Hispanic culture and language that combined elements from the Native Americans, Africans, and Iberians. In 1898, following the Spanish -- American War, the United States acquired Puerto Rico along with other Spanish colonies under the terms of the Treaty of Paris.
Document 10: Independence movement in Puerto Rico: After four hundred years of colonial rule by the Spanish Empire, Puerto Rico finally received its sovereignty in 1897 through a Carta de Autonomía (Charter of Autonomy). It was signed by Spanish Prime Minister Práxedes Mateo Sagasta and ratified by the Spanish Cortes.
Document 11: Hurricane Maria: Hurricane Maria was regarded as the worst natural disaster on record in Dominica and Puerto Rico. The tenth-most intense Atlantic hurricane on record and the most intense tropical cyclone worldwide of 2017, Maria was the thirteenth named storm, eighth consecutive hurricane, fourth major hurricane, second Category 5 hurricane, and the deadliest storm of the hyperactive 2017 Atlantic hurricane season. At its peak, the hurricane caused catastrophic damage and numerous fatalities across the northeastern Caribbean, compounding recovery efforts in the areas of the Leeward Islands already struck by Hurricane Irma. Maria was the third consecutive major hurricane to threaten the Leeward Islands in two weeks, after Irma made landfall in several of the islands two weeks prior and Hurricane Jose passed dangerously close, bringing tropical storm force winds to Barbuda.
Document 12: History of Puerto Rico: On August 10, 1815, the Royal Decree of Grace was issued, allowing foreigners to enter Puerto Rico (including French refugees from Hispaniola), and opening the port to trade with nations other than Spain. This was the beginning of agriculture-based economic growth, with sugar, tobacco, and coffee being the main products. The Decree also gave free land to anyone who swore their loyalty to the Spanish Crown and their allegiance to the Roman Catholic Church. Thousands of families from all regions of Spain (particularly Asturias, Catalonia, Majorca and Galicia), Germany, Corsica, Ireland, France, Portugal, the Canary Islands and other locations, escaping from harsh economic times in Europe and lured by the offer of free land, soon immigrated to Puerto Rico. However, these small gains in autonomy and rights were short lived. After the fall of Napoleon, absolute power returned to Spain, which revoked the Cádiz Constitution and reinstated Puerto Rico to its former condition as a colony, subject to the unrestricted power of the Spanish monarch.
Document 13: Puerto Rico: Originally populated by the indigenous Taíno people, the island was claimed in 1493 by Christopher Columbus for Spain during his second voyage. Later it endured invasion attempts from the French, Dutch, and British. Four centuries of Spanish colonial government influenced the island's cultural landscapes with waves of African slaves, Canarian, and Andalusian settlers. In the Spanish Empire, Puerto Rico played a secondary, but strategic role when compared to wealthier colonies like Peru and the mainland parts of New Spain. Spain's distant administrative control continued up to the end of the 19th century, helping to produce a distinctive creole Hispanic culture and language that combined elements from the Native Americans, Africans, and Iberians. In 1898, following the Spanish -- American War, the United States acquired Puerto Rico under the terms of the Treaty of Paris.
Document 14: Hurricane Maria: Originating from a tropical wave, Maria became a tropical storm on September 16, east of the Lesser Antilles. Highly favorable environmental conditions allowed the storm to undergo explosive intensification as it approached the island arc. The hurricane reached Category 5 strength on September 18 just before making landfall on Dominica, becoming the first Category 5 hurricane on record to strike the island. After weakening slightly due to crossing Dominica, Maria achieved its peak intensity over the eastern Caribbean with maximum sustained winds of 175 mph (280 km / h) and a pressure of 908 mbar (hPa; 26.81 inHg), making it the tenth-most intense Atlantic hurricane on record. On September 20, an eyewall replacement cycle took place, weakening Maria to a high - end Category 4 hurricane by the time it struck Puerto Rico. Interaction with land further weakened the hurricane, though it regained some strength as it moved northeast of The Bahamas. Moving slowly to the north, Maria gradually degraded and weakened to a tropical storm on September 28. Embedded in the westerlies, Maria accelerated toward the east and later east - northeast over the open Atlantic, becoming extratropical on September 30 and dissipating by October 3.
Document 15: Hurricane Maria: Hurricane Maria was regarded as the worst natural disaster on record in Dominica and Puerto Rico, and caused catastrophic damage and triggered a major humanitarian crisis in the latter. The tenth-most intense Atlantic hurricane on record and the most intense tropical cyclone worldwide thus far in 2017, Maria was the thirteenth named storm, eighth consecutive hurricane, fourth major hurricane, second Category 5 hurricane, and the deadliest storm of the hyperactive 2017 Atlantic hurricane season. At its peak, the hurricane caused catastrophic damage and numerous fatalities across the northeastern Caribbean, compounding recovery efforts in the areas of the Leeward Islands already struck by Hurricane Irma just two weeks prior. Maria was the third consecutive major hurricane to threaten the Leeward Islands in two weeks, after Irma made landfall in several of the islands two weeks prior and Hurricane Jose passed dangerously close, bringing tropical storm force winds to Barbuda.
ground_truth: September 20
sub_queries: where did the immigration lead to? Answer: Puerto Rico
when did hurricane maria make landfall in Puerto Rico Answer: September 20