When full-scale war erupted between China and Japan..., the Open-Door Policy in China and the Washington Naval Conference agreements.
Answer:
A few examples of the checks and balances are:
The president can veto a bill, but if 2/3 of congress vote they can override the veto
The president can make treaties, but only with a two-thirds agreement from the Senate
The vice president is also the president of the Senate
Explanation:
After the freedom summer campaign many things happened but the main thing is that African Americans got there voting rights