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.
These problems mostly included the issue of racim which was a very problematic issue in the 19th and the 20th century. Not only this, another issue were the rights of women and worker rights in the US.
<span>C "Every Bill which shall have passed the House of Representatives and the Senate shall, before it become a Law, be presented to the President of the United States; if he approve he shall sign it, but if not he shall return it". This sentence describes how laws are made in the US and is the only one which relates to the concept of the "rule of law".</span>