Explain a topic that Joe Biden said in his speech during the inauguration

This passage says that the government is necessary because . the passage states that checks and balances are needed to

Plz ! after the first battle of bull run general ivan mc dowell was removed from command of the union army he was replaced by a. general ulysses s. grant. b. general george mcclellan. c. general robert e lee. d. general george meade.

Which of the presidents major role does this passage demonstrate