From the Washington Times, an article about priests from other countries filling the gaps

But church officials say they do not actively recruit priests from other countries.
“They are looking to come here,” said Anne Edwards, spokeswoman for the Diocese of Richmond.
Priests from other countries come to the United States because the standard of living is higher here than in other parts of the world, said Dean Hoge, sociology professor at Catholic University. He said the prospect for a priest in Kenya or Nigeria being assigned to a parish in the United States is desirable.

“It is ironic,” Mr. Hoge said, adding that traditionally men join the priesthood out of selfless desires and are eager to abandon worldly possessions. “This is a little embarrassing, but some motives are different.”