U.S. authorities last week seized 43,000 rounds of ammunition in two separate stops at one of the four international border crossings in Nogales, Arizona. In a Monday social media post, U.S. Ambassador to Mexico Ronald Johnson said the seizure at the Mariposa Port of Entry reaffirms the U.S. government’s commitment to disarming drug cartels and stopping the illegal flow of weapons to Mexico. The border officials found 40 boxes in one of the stop…