With last week’s primaries in Arizona and Florida in the rearview mirror, the 2018 primaries are almost over. Only five states still have primaries left; New York is holding the country’s final primaries of the cycle on Sept. 13.

So, how are these midterms shaping up historically? Based on past predictions and results, the battle for the House of Representatives in particular looks more and more like it will be a wave election. Democrats could make major gains.