Global warming is the answer ( C)
<span>The answer to this question is sensory memory.</span>
<span>Sensory memory is the memory that is
perceived by our senses. All information stored in sensory memory is transferred
to the short term memory. Sensory memory that is stored is always short and
retained in a short period of time. </span>
It would might be C relieved
I think the best way to summarize it is:
1) through a number of purchases:
Louisiana Purchase,
Gadsden Purchase
2)Through Anexation of the Republic of Texas (independent at the time)
3) and through war (The Mexican American-war, which lead to the Mexican Cession)
Attacks by Germanic tribes.