Which expansion created the final border between the us and Mexico A) Texas annexation
B) Oregon county
C)Mexican cession
D)Gadsden purchase

What was the result on the u.s. economy because of the major changes in atlantic shipping prior to and during the war of 1812?

The rise of advertising in the 1920s. i am good with seeing how advertisements shape the roaring twenties and how it developed a new way of life through modern days. but i am not sure what the details of advertising in the 1920s were. if possible can you send me links (preferrably credential links) to sources that maybe show like the first company to start advertising through the radio, how advertising benefits (statistics graphs), etc.

Why might the greeck city states have an advantage over the persians