Answer:
Many who settled in the New World came to escape religious persecution. New World grains such as corn kept the colonists from starving while, in Virginia, tobacco was found to be a valuable cash crop.
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You are most likely referring to the assassinations of Martin Luther King Jr and Malcolm X. The impacts of both of their assassinations was that the Civil Rights movements actually grew stronger, with more African Americans and white Americans coming together to fight for equality on the streets, in Presidential elections, and through activism in Churches. Both MLK and Malcolm X were good men who fought for the rights of African Americans, and they will forever be remembered for their lasting impression on this nation, not only by other African Americans, but by all Americans.
Many religious communities have the term Sisters of Charity as part of their name. While some Sisters of Charity communities refer to the Vincentian tradition, and in America to the tradition of Saint Elizabeth Ann Seton those links are by no means universal. It is important to recognize that there may be no "family" or historical relationship between groups having the phrase Sisters of Charity as part of their name. The rule of Vincent de Paul for the Daughters of Charity has been adopted and adapted by at least sixty founders of religious institutes around the world in the subsequent centuries.
After the roarin 20s the economic started to fail because of job losses which caused the great depression (1930s).