Border states such as Maryland soon began to act ... now that the court had ruled them noncitizens. It took the post-Civil War constitutional amendments to overturn that ruling.

Kansas and Missouri put a stop to this kind of back-and-forth business poaching more than five years ago when officials in both states agreed to a ceasefire in the so-called economic border war.

BEIJING--China’s military is carrying out armed patrols near the Myanmar border this week, where the government is concerned about potential fallout from fierce fighting in a civil war on the ...