Why did the war break out between the united states and the plains indians

If there were no system of checks and balance,the process of government would eventually fall apart. do you agree with this opinion? why or why not?

Which of these describes a social effect of the civil war? a) fields were left unplanted because the slaves had been freed and much of the male population was unavailable to plant or harvest crops. b) over 600,000 men died, mostly because of the lack of food, clean water, and hygienic medical practices. c) after the emancipation proclamation was issued, african americans were allowed to join the union army. d) lincoln’s assassination after the surrender caused a disruption in the rebuilding of the nation.

What is the volume of the cone? (use 3.14 for π.) height of 12 ft and width of 7 fast i will give u brainliest my friend mike is a re tardd