When the nation’s economy ground to a halt this spring, economists warned that an avalanche of evictions was looming. The federal government and many states rushed to ban them temporarily. Twenty states, including Louisiana, Texas, Colorado and Wisconsin, have since lifted their restrictions, and researchers have tracked thousands of recent eviction filings in places where data is available. Eviction bans in nine other states — including Minnesota — and at the federal level are set to expire by the end of the month.