American exceptionalism is an overblown and provincial tradition, but it’s our 250th birthday, so let’s indulge. As The New Republic’s USA 250 series showed—on newsstands now!—the country has gotten a lot wrong, but it’s also gotten a lot right. Here are some of the biggest achievements we can boast about, but which, in the Trump era, are eroding or precarious. Welcoming immigrants: In his last speech as president, more than two years after signing the biggest amnesty for undocumented immigrants