The FO check-ride is just about the same as a CA check-ride, you just don't get a type rating. The FAA does not require FOs to have a type rating.
Also currently most airlines operating narrow bodies and larger require new hire pilots to have 1,000 hours command time on turbine aircraft before they'll even interview them.
The US domestic market is dominated by regional jets, and narrow bodies (73, A320). In the US most pilots look at flying a "big" airplane like an A320 or 73 as a "privilege" that has to be earned by flying smaller jets or turbo props first. It's very very rare to see a US airline looking for DECs.