Why are today's ouachita mountains shorter than they once were?
a. wind and water eroded them over millions of years.
b. an earth-quake suddenly broke them into pieces.
c. a collapsed magma chamber hollowed the ground below them.
d. tectonic plates collided on both sides of the mountain.
for the .
(if you do not know do not tell, if so you will be reported)

a. because the u.s. was the leading with the most technology, economy, etc. also was teamed with other allies witch boosted the economy and materials to improve technology and use it.

just need the points

explanation:

it provided for selection of government employees through competitive examinations. it also made it unlawful to fire or demote covered employees for political reasons or to require them to give political service or payment, and it set up a civil service commission to enforce the law.

explanation:

it the big letter b heart my answer