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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The statement or situation that portrays inadequate data is the third one: Rupal determines aluminum is the most reactive metal by completing only half of her experiment. By not completing the experiment, this student has obtained inadequate data and reached a wrong conclusion. The most reactive metal (the most likely to undergo a chemical reaction in contact with water, acids, and steam, for instance) in the reactivity series list is actually potassium, not aluminum (although aluminum is indeed a very reactive metal).
It is specifically focused on an argument which defines your goal and the scope of the thesis. Its main purpose is to support and prove your main argument. It's like a person arguing to prove his position which means he is making a claim. If written effectively, a claim statement will keep your readers interested.
I think the best way to summarize it is:
1) through a number of purchases:
Louisiana Purchase,
Gadsden Purchase
2)Through Anexation of the Republic of Texas (independent at the time)
3) and through war (The Mexican American-war, which lead to the Mexican Cession)