Germany was unified under the king of nation 1, which before 1871 was the kingdom of

The Unification of Germany into the German Empire, a Prussia-dominated state with federal features, was officially proclaimed on 18 January 1871 in the Hall of Mirrors at the Palace of Versailles in France.

Explanation:

I looked it up. If it's wrong, I'm sorry. I don't know anything else.

one of the main reasons was definitely slavery. back in 1861, republican abraham lincoln was elected and ended up being a major influence in the slavery business. slavery greatly affected the texas economy because back in 1845 during the annexation of texas, slaves became a big part of the texas population. many texans that were in favor of the secession influenced groups through party ties.

abraham lincoln