Title: 2010 Chile earthquake
Content:  This was the strongest earthquake affecting Chile since the magnitude 9.5 1960 Valdivia earthquake (the most energetic earthquake ever measured in the world), and it was the strongest earthquake worldwide since the 2004 Indian Ocean earthquake and until the 2011 Tōhoku earthquake. It is tied with the 1906 Ecuador–Colombia and 1833 Sumatra earthquakes as the sixth strongest earthquake ever measured, approximately 500 times more powerful than the 7.0 Mw earthquake in Haiti one month prior in January 2010.
Title: 2016 Oklahoma earthquake
Content:  The 2016 Oklahoma earthquake occurred on September 3, 2016 near Pawnee, Oklahoma. Measuring 5.8 on the moment magnitude scale, it is the strongest in state history. At 5.8 magnitude, this ties it with the 2011 Virginia earthquake, which was determined after it struck to be the most powerful quake in the eastern United States in the preceding 70 years.
Title: Foreshock
Content: The strongest recorded mainshock that followed a foreshock is the 1960 Valdivia earthquake, which had a magnitude of 9.5 MW. ; Note: dates are in local time 
Title: Oklahoma earthquake swarms (2009–present)
Content:  area and the September 3, 2016 earthquake near Pawnee, north of Prague. The 2011 Prague earthquake, at reported magnitude 5.6, was at the time the strongest recorded earthquake in the history of Oklahoma. The 2016 earthquake was initially reported to be an identical 5.6 magnitude, but this was later upgraded to 5.8, making it the strongest earthquake on record. Simultaneously, the USGS upgraded the magnitude of the Prague earthquake to 5.7. Numerous seismologists had advised local residents of an even greater risk of earthquakes in 2014, by which time the number of earthquakes had increased to a dangerously high level. In response to the major increase in earthquakes in the Central United States, the United States Geological Survey (USGS) began 
Title: 2021 Chignik earthquake
Content:  An earthquake occurred off the coast of the Alaska Peninsula on July 28, 2021, at 10:15 p.m. local time. The large megathrust earthquake had a moment magnitude of 8.2 according to the United States Geological Survey (USGS). A tsunami warning was issued by the National Oceanic and Atmospheric Administration (NOAA) but later cancelled. The mainshock was followed by a number of aftershocks, including three that were of magnitude 5.9, 6.1 and 6.9 respectively. This was the largest earthquake in the United States since the 1965 Rat Islands earthquake, and the 7th largest earthquake in US history. It was also the strongest earthquake 
Title: 2014 La Habra earthquake
Content:  The earthquake was the most powerful earthquake in Southern California since the 2008 Chino Hills earthquake which had a moment magnitude of 5.4. Its epicenter was 1 mile east of La Habra and its hypocenter was 3.2 mile deep. Initial reports placed the magnitude at 5.3, however it was later corrected to magnitude 5.1. Although the ShakeMap displays a vast area of highest Mercalli intensity of VI (Strong), the maximum observed Mercalli intensity was VII (Very strong), reported in La Habra, Brea, La Habra Heights, and Rowland Heights. In the area close to the epicenter, the greatest recorded Mercalli intensity for the DYFI map (Did You Feel It?) was VI (Strong). In Pasadena, the earthquake early warning system (ShakeAlert) provided a four-second warning before shaking arrived.
Title: 1984 San Pedro Basin earthquake
Content:  The United States Geological Survey estimated that more than 227,000 people were exposed to intensity VII (Very strong) shaking and more than 2.8 million experienced intensity VI (Strong) shaking.
Title: 1857 Fort Tejon earthquake
Content:  The 1857 Fort Tejon earthquake occurred at about 8:20 a.m. (Pacific time) on January 9 in central and Southern California. One of the largest recorded earthquakes in the United States, with an estimated moment magnitude of 7.9, it ruptured the southern part of the San Andreas Fault for a length of about 225 miles (350 km), between Parkfield and Wrightwood. Though the shock was centered near Parkfield, the event is referred to as the Fort Tejon earthquake, because that was the location of the greatest damage. Fort Tejon is just north of the junction of the San Andreas and Garlock Faults, where the Tehachapi, San 
Title: 1931 in the United States
Content: August 16 – Texas experiences an earthquake with a moment magnitude of 6.5, the most powerful earthquake in its recorded history. 
Title: 2004 in science
Content: September 28 – A long-awaited earthquake strikes Parkfield, California, the most closely monitored earthquake zone in the world. The earthquake, which had been expected to have occurred by the late 1980s, strikes at a magnitude 6.0. The network of instruments that had been installed in the region make this the most well-recorded earthquake in history. ; December 26 – Indian Ocean earthquake and tsunami. 

Question: what is the strongest earthquake in the united states?
Answer: 1964 Alaska earthquake and tsunami.
1700 Cascadia earthquake.