Which of the following contributed to the u. s. failure in vietnam? select all that apply.
a.
the united states did not study vietnamese history or ask enough questions.
b.
china and vietnam had been close allies for centuries.
c.
the vietnamese had expert guerrilla fighters.
d.
the united states overestimated the cost and length of the war.

Brainliestttme : )why was the launch of sputnik in 1957 important? -most in the u.s. had not thought the soviets were capable of producing satellite technology.- it made clear that the u.s. space program was dominant.- most in the soviet union had not thought the u.s. was capable of launching manned aircraft. -it established the fact that a more dangerous hydrogen bomb could be created.

What actions did americans take to show their patriotism after peal harbor

What happened as agriculture became entrenched in the south ?