Miguel Cruz wrote:

For a US citizen, re-entering the US from Canada or the DR with a driver's
license and birth certificate is no problem.

That's true, but the OP is going to need a passport anyway. The OP had
indicated travel from Dominican Republic to Canada, and then onward to
the US.

"U.S. citizens entering Canada from a third country must have a valid
passport."

Above quoted directly from http://travel.state.gov/travel/canada.html

K.