Why did Democrats lose power during Reconstruction? because African Americans gained the right to vote
because white voters no longer believed in their cause
because the Democrats lacked strong leadership
because the president refused to give them power

Because African Americans gained the right to vote

Explanation:

So a huge population of new citizens all voted republican because Republicans were the ones who fought for their independence and rights.

what the first or next guy says

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.