I have read a proposal to merge Vermont and New Hampshire into a state called "Montana Verde", or "Green Mountain". (It is pronounced like the state of Montana plus VER-day.) The reason for this is that they are small in size and population for US states. Another cited reason is that New Hampshire is more racially diverse than Vermont.
The main purpose of the idea is to let DC become a state while keeping the number of US states at 50. Could two US states be merged? If so, how could that be done for Vermont and New Hampshire?
Note: "Montana Verde" seems like a gerrymander to me because it is sucking up a 65% or so Democratic leaning state and putting it into a 50% Democratic leaning state.