Its the Gold Rush which occured in 1848.
Answer:
3) Europeans explore the Americas
That the abolition movement gained support as the law forced Northerners to take part in the system of slavery.
Answer:
As per the constitution, the two major obligation that the federal government have over to the state government operating are as follows :
1. To protect the state government from any kind of invasion form some foreign enemy.
2. When requested to defend the state from regional aggression by the state legislature - or governor if the legislative is not in action.