Select the correct answer. According to the safety valve theory, what would occur once the American frontier was closed?
A.
The concept of what it meant to be American would be changed by Influxes of immigrants.
OB.
The population of the country would quickly overwhelm its natural resources,
Ос.
Social conflict would increase because citizens would not have any place to make a fresh start.
OD.
Economic growth would halt because businesses would not have new markets to conquer.

the answer here would be

answer

the statement that best describes president carter’s attempt to free the hostages in iran is c. all of the attempts failed.

explanation

the operation eagle claw conducted by the united states armed forces was a failed mission which aimed to rescue 52 americans captured as hostages in the american embassy, tehran on 24/4/1980.the mission was authorized by president jimmy carter. the failures included;   obstacles in operation that included operational conditions challenges caused by sandstorms, hydraulic problems of one the helicopters and , mechanical failure of another helicopter that was identified as a cracked rotor blade and the crashing of another helicopter during mission abortion causing death of 8 service persons.

the united states broke it's neutrality was the constant german sinking of trading vessels resulting in the loss of lives, one example would be the lusitania.

the correct answer is c.