SAN JUAN, Puerto Rico (AP) — Most of Haiti on Tuesday was celebrating the anniversary of a historic battle that helped the country become the world’s first Black republic, but a town that was key in that struggle was busy fighting for its life. Residents in the once peaceful coastal town of Arcahaie , the birthplace of Haiti’s flag, joined forces with police on Tuesday to push back heavily armed gangs trying to seize control of their community. “We are holding them off for the moment,” Mayor