Answer: Acquired after the Missouri Compromise, which did not include those territories.
Explanation:
The Mexican Cession was the large region of land that Mexico ceded to the United States in the Treaty of Guadalupe Hidalgo in 1848. It included territory that would later become the states of California, Nevada, Utah, and parts of what would become Arizona, New Mexico, Colorado and Wyoming.
The Missouri Compromise (1820) had admitted Missouri into the Union as a slave state with Maine being added at the same time to keep the balance of slave and free states equal. It also prohibited any future slave states north of the 36/30' latitude line north of the equator in territories of the Louisiana Purchase, with the exception of Missouri (north of that line) being admitted as a slave state. Since that latitude line ran right through the middle of the Mexican Cession territory, and because the Missouri Compromise had only addressed lands acquired in the Louisiana Purchase territories, there was bound to be further debate over the issue of slave vs. free states.
The extension of a nation's authority by territorial acquisition or by the establishment of economic and political dominance over other nations.
The post World War 2 baby boom was caused by A) marriage at an earlier age.
Let's look into te options one by one:
A) marriage at an earlier age.
This is true.
As there was a lack of sense and knowledge of birth control in the developing countrues due to insufficient education, people usually get marry at an early age as well as giving birth at a early age, and this cycle continues to cause the birth rate to be high.
B)the loss of population during the war
This is false.
The loss of population indeed happened however the effect of this should be decreasing the birth rate due to lower population density. The will to give birth is also not due to there is lack of population.
C) women refusing to go back to work after war
This is false.
Contrarily, more women started to work after WWII as much menpower is used on the war as army. Many continues to take up the role of labour after WWII to make a living.
D) the invention and distribution of the birth control pill
This is false.
The insvention of it would be used to control the birth rate instead of causing an increase and thus is incorrect.
Therefore the answer is A) marriage at an earlier age.
Hope it helps!