<span>The United States would oversee the continuance of the Open Door policy.</span>
The correct answer is <span>A. By approval of conventions in three-fourths of the states
The most common way is the third one, three-fourths of state legislatures and a supermajority of the congress approves it, however, only once the first method was used. It is a legitimate option outlined in the constitution. The congress can call for national conventions which can pass the amendment but this doesn't happen often.</span>
Ok so when the americans moved west, they built plantations and needed slaves for the plantations. In the east, however, the northern half wanted to free all of them.
The Gulf Coast (not to be confused with the American Gulf Coast) contains significant oil and natural gas deposits.
Hope this helps!
