Answer:
1.)The De Jure discrimination is Established by C; racial segregation. This was also known as the Jim Crow laws. These "laws" were made to give whites a superiority in the south. The laws lasted from 1880 until 1964. When racial segregation was finally ended.
2:) The case that established the foundation for civil rights before the U.S Supreme court ruling in the Brown v. Board of Education was C; Mendez v. Westminster. This case was about a little girl named Sylvia Mendez. California federal court decided the case 8 years before Brown V. Board of Education. Sylvia was not allowed to attend school because the school was for "whites only." The judge favored for Sylvia and she won a class action lawsuit. The judge agreed that the school was discriminatory against students of Mexican heritage.
3:) The Missouri Compromise of 1850 was an agreement to open southern territories west of the Mississippi to slavery while closing northern territories to slavery. The correct answer is A. The Missouri Compromise was made by Congress to try and diffuse the rivalries in the state. The state wanted to be a slave state legally and many opposed this. This led to the Compromise. The government wanted the states to be evenly numbered as to who had slaves, Missouri owning slaves freely would make the number uneven.