The discovery of gold here started the first u. s fold rush in 1828

True

Explanation:

The news of gold brought approximately 300,000 people from the rest of the united states.

answer; if congress didn't act on certain requests;

answer:

d. because dr. laguardia selected a widely used measure, his study generalizes to has strong external validity. external validity has limited external validity. other applications of this measure.

the widely used measure that he applied to his experiment was the benton facial recognition test. it employed on to football players and as result, only players who suffered brain concussions did not pas this test. and although it has an external validity, it is limited because it isn't general to apply to other population.