Since MLS teams now are required to actually pay for their players, the TV money has been upped to what I believe is realistic numbers (slightly less than the Bundesliga). Transfers are now just like any European Division.
American Premier League
American First Division
NPSL (4 sub-divisions)
PDL (10 sub-divisions)
US Club Soccer
Lamar-Hunt US Open Cup includes all of the teams from the top 3 divisions, some from all of the NPSL and PDL divisions and 1 from the USASA and US Club soccer. Prize money has also been increased for this competition, all 3 top divisions, and the CONCACAF Champions League.
All teams have a U-18 team as well. NPSL and PDL U-18 leagues are buggy but still have youth intake.
Relegation and promotion works between every league.
Note: It is highly recommended you use the add generated players and allow key staff to be added since most lower division teams are not populated.