In World History, a declaration of independence does exactly that: declare a country's independence from a mother country. For example, the United States declared independence from England, and Comoros declared independence from France.
Bull Connor was the Commissioner of Public Safety in Birmingham in the 1960s and led a violent crackdown on civil rights protestors.
This violent crackdown included the siccing of police dogs on protestors and the use of fire hoses on protestors. National attention turned to the treatment of the protestors when news reports showed video of how the protestors were being violently attacked by the police and public opinion turned against Bull Connor.
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Here is a list of the correct statements:
1) Ended the war between the United States and Mexico- The Treaty of Guadalupe Hidalgo ended the Mexican-American War in 1848.
2) Ceded territories from Mexico to the United States- This is also known as the Mexican Cession. The US gained territories that would later become states, such as California, Arizona, New Mexico, Utah, and Colorado.
3) Called for the US to pay Mexico $15 for lands in the Mexican Cession.