Jason Riley’s “Mr. President, Don’t Abandon the Dreamers” (Upward Mobility, Nov. 13) should have been headlined: “Congress, Don’t Abandon the Dreamers.” President Obama knew he didn’t have the power to make an executive action stick, but he did it anyway because Congress wouldn’t act. When President Trump came into office he tried to make DACA permanent by urging Congress to pass it into law. The courts, as usual, intervened to stop him and Congress did what it always does, nothing.

President Abraham Lincoln knew the Emancipation...