Answer:
The Right to Vote
The 15th Amendment, ratified in 1870, presumably guaranteed the vote to people of color. Nevertheless, the oppressive and violent racial system in the South prevented African-Americans from voting. Some Mexican-Americans faced similar obstacles when attempting to vote. President Lyndon Johnson asked Congress in 1965 to issue legislation enforcing the spirit of the 15th Amendment. This request came after the savage beating of protesters in Selma, Alabama, during a march to encourage African-American voter registration.
The 1965 Voting Rights Act required districts with histories of extremely low minority voter turnout to seek federal approval before making any changes to election laws. Over the years, voting patterns changed and the Democratic Party began receiving undeniable support among African-Americans and others. These racial minorities have played a central role in national elections, including the 2008 and 2012 elections of President Barack Obama.
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Explanation:
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For it's great port cities. Plus they didn't want the British to claim it from Mexico.