What are the most important measures of the first presidency of Hipolito Yrigoyen?

help me with this one please

Brainliesttt ! : ) -global military, political, and psychological responses to terrorism?

How did the united states respond when north vietnam attacked a us warship and sent troops to south vietnam in the early 1960s? a. the united states declined to assist south vietnam against the north. b. us leaders authorized south vietnam to invade north vietnam. c. the president did not sign the gulf of tonkin resolution. d. congress authorized the president to escalate the conflict.

How long have counties been a part of the government structure of the united states?