Spine, cranium and rib cage.
Explanation:
Cant be A because On May 13, 1846 the United States Congress passed An Act providing for the Prosecution of the existing War between the United States and the Republic of Mexico
Can't be B because Mexico did declared a defensive war against the U.S. on April 23, 1846.It would defend territories under the attack but would not take the offensive.
Can't be C because On April 25, 1846, a 2,000-strong Mexican cavalry detachment attacked a 70-man U.S. patrol that had been sent into the contested territory north of the Rio Grande and south of the Nueces River. In the Thornton Affair, the Mexican cavalry routed the patrol, killing 16 American soldiers.
Is D because can't find any information on this and the rest are true.
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The sectional crisis among the southern and the northern states was how to incorporate vast territories in the nation and whether states would be slave or non slave.
<u>Explanation:</u>
From the time of 1848 to 1860, there were sectional crisis in the United States of America. The problem was how to inculcate vast territories in the nation after the end of the American Mexican war. Moreover the political tension was that whether the states would be slave or non slave.
The southern states favored the slavery as a fact of life while the northern states were against slavery and wanted better and equal lifestyle for the slaves also. Moreover the northern states were rich and the southern were poor and had lesser number of factories compared to north.
