Yes...
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During WWll, with white men fighting overseas, African Americans were able to get better job opportunities, and a new law passed saying that blacks and whites had to be in integrated units in the army. But, when the war ended and black soldiers returned to America they weren't greeted with a hero's welcome and instead were treated like all other blacks- they were forced to be segregated. This change from almost equality to none at all really fired up the Civil Rights Movement in the 1950's and 1960's.
Correct answer: C) France
North America is a continent geographically. It is not all under a single government.
Los Angeles has significant population and some territorial size, but its city government is not sovereign. It is under a state government (California) and a national government (the United States).
Similarly, Texas -- at this point in history -- is not independently sovereign, but is one of the 50 states that make up the USA as a true state with all the characteristics listed. There was a time in Texas' history when it was a sovereign state on its own -- during the years of the Republic of Texas, which existed from 1836 to 1846.