What was John Adams Biggest mistake in office

The Alien and Sedition Acts

Explanation:

he even says later that signing them had been his biggest mistake.

yes.

explanation:

because it let the japanese know who had the upper hand in the war.

during the 20th century, the role of the vice president has evolved into more of an executive branch position. now, the vice president is usually seen as an integral part of a president's administration and presides over the senate only on ceremonial occasions or when a tie-breaking vote may be needed.