One of the most transformative things Democrats could do with their narrow majority in Congress would be to grant statehood to all the remaining inhabited US territories. That would make five new states: Washington DC, Puerto Rico, the US Virgin Islands, American Samoa, and the Mariana Islands (a reunion of the Northern Mariana Islands and Guam, which is the southern Mariana Island).
There are no constitutional barriers to admitting all five of these states. The US Constitution gives Congress the power to admit new states as long as it assures they are republics and that the majority of people of the territory want to be admitted. The Senate will have to eliminate or reduce the power of the filibuster to do so without Republican support, but the filibuster is a Senate rule that the majority has the power to change.
All five of these territories have larger populations than Nevada did when it was admitted with around 40,000 people in 1864. Washington, DC is larger than two existing states and Puerto Rico is larger than 21 states. The populations of all five are:
