Extract the answer to the question from the following context. Question: __ marked the disputed Texas border at the Nueces River. Context: During the American occupation of the state, the number of Indian attacks was drastically reduced, but in 1848 the attacks resumed to such a degree that the Mexican officials had no choice but to resume military projects to protect Mexican settlements in the state. Through the next three decades the state faced constant attacks from indigenous on Mexican settlements. After the occupation the people of the state were worried about the potential attack from the hostile indigenous tribes north of the Rio Grande; as a result a decree on July 19, 1848, the state established 18 military colonies along the Rio Grande. The new military colonies were to replace the presidios as population centers to prevent future invasions by indigenous tribes; these policies remained prominent in the state until 1883. Eventually the state replaced the old state security with a state policy to form militias organized with every Mexican in the state capable to serve between the ages of 18 and 55 to fulfill the mandate of having six men defending for every 1000 residents.
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Answer: Mexican

Extract the answer to the question from the following context. Question: who had a genuine duty to offer himself as a candidate? Context: President Truman, symbolizing a broad-based desire for an Eisenhower candidacy for president, again in 1951 pressed him to run for the office as a Democrat. It was at this time that Eisenhower voiced his disagreements with the Democratic party and declared himself and his family to be Republicans. A "Draft Eisenhower" movement in the Republican Party persuaded him to declare his candidacy in the 1952 presidential election to counter the candidacy of non-interventionist Senator Robert A. Taft. The effort was a long struggle; Eisenhower had to be convinced that political circumstances had created a genuine duty for him to offer himself as a candidate, and that there was a mandate from the populace for him to be their President. Henry Cabot Lodge, who served as his campaign manager, and others succeeded in convincing him, and in June 1952 he resigned his command at NATO to campaign full-time. Eisenhower defeated Taft for the nomination, having won critical delegate votes from Texas. Eisenhower's campaign was noted for the simple but effective slogan, "I Like Ike". It was essential to his success that Eisenhower express opposition to Roosevelt's policy at Yalta and against Truman's policies in Korea and Chinamatters in which he had once participated. In defeating Taft for the nomination, it became necessary for Eisenhower to appease the right wing Old Guard of the Republican Party; his selection of Richard M. Nixon as the Vice-President on the ticket was designed in part for that purpose. Nixon also provided a strong anti-communist presence as well as some youth to counter Ike's more advanced age.
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Answer: Eisenhower

Extract the answer to the question from the following context. Question: What happened in the 77th year of the 19th century? Context: Symbiosis (from Greek "together" and "living") is close and often long-term interaction between two different biological species. In 1877 Albert Bernhard Frank used the word symbiosis (which previously had been used to depict people living together in community) to describe the mutualistic relationship in lichens. In 1879, the German mycologist Heinrich Anton de Bary defined it as "the living together of unlike organisms."
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Answer:
Albert Bernhard Frank used the word symbiosis (which previously had been used to depict people living together in community) to describe the mutualistic relationship in lichens