What is meant by party unity, and in what states is it typically found?

What will be an ideal response?

An ideal response would be:
Party unity is the degree to which members of the same party vote together on bills and differently from members of the other party. It varies substantially across states. In fact, party unity scores in many state legislative chambers exceed those observed in the U.S. House of Representatives. Legislators in California, Washington, Colorado, Minnesota, Wisconsin, and Texas are among the most polarized, whereas those from Oregon, Louisiana, Rhode Island, and West Virginia are among the least polarized