How did the war with Mexico affect sectional tensions (North vs South) with the US? What is Popular sovereignty? Was this an easy way out for politicians?

What is secession?

Who were the 49ers?

Explain the parts Compromise of 1850.

When did paul zoll develop cardiac pacemaker

In what way did expansion and global trade during the 15th to 18th centuries affect the economies of european countries

What do most climatologists see as a major cause of rising global temperatures? a. earth's closer proximity to the sun due to its gravitational pull b. greenhouse gases produced by burning fossil fuels c. rising ocean levels caused by melting polar ice sheets d. water pollution cause by industrial waste