15- all of the following were causes of the mexican war except
a. u. s. annexation of the formerly mexican-held republic of texas.
b. american desire for california.
c. mexican desire to annex louisiana.
d. the disputed southern boundary of texas

C. Mexican desire to annex Louisiana

Explanation:

This started with Texas disagreeing with the Mexican government, as Texas wasn't part of the United States at this time. When Texas eventually did become a state of the United States, Mexico did not like this and had numerous disagreements over where the border actually was, and who had what. Along with this, America did want California, which Mexico ended up selling to the United States, along with a couple other current states, in the Treaty of Guadalupe Hidalgo. The Mexican desire to annex Louisiana had nothing to do with the causes of the Mexican-American War.

an era of negotiation.

is that an answer to your question?

the installment plan of the 1920s, an arrangement that allowed people to buy what they wanted with a small down payment and pay off the rest in monthly installments, provided americans a way to own what they did not have the money to buy.