Many reports on the Regional Plan Association website of their vision for America 2050.
See link here rpa.org/work/reports?series=america-2050
“We cannot leap into world government in one quick step … The precondition for eventual globalization – genuine globalization – is progressive regionalization. Because thereby we move toward larger, more stable, more cooperative units.” Zbigniew Brzezinski , former US National Security Adviser (1977-1981) 1995
Map of the Mega-Regions for America 2050. Please note that portions overlap with Canada (Cascadia) and Mexico (So. California).