Republicans control 68 of the nation’s 99 state legislative chambers. They hold both chambers in 32 states, which contain 61 percent of the U.S. population. Democrats meanwhile hold just 31 chambers and both of them in only 13 states, amounting to a mere 28 percent of the population. Why are Republicans so dominant at the state legislative level even after an election where Democrats narrowly won the presidential popular vote? Although there are many reasons, gerrymandering is one of the most important ones.