The states of MA,CT,RI,NH,ME and VT are over represented in the US Senate. As California leaves the I think those 6 states should be combined into one state with just 2 senators instead of 12! Call it the state of New England.
Propose a trade to Canada: New England, NY, NJ, WA, OR and CA*, ** for Alberta, Manitoba and a province to be named later
* all CA WA OR West of mountain ranges
** US will retain Bremerton, San Diego, 29 Palms, March AFB, Fort Lewis, McCord AFB, Travis AFB and other military bases in CA, WA