NEW YORK — As more than 1 million Puerto Ricans return to Fifth Avenue on Sunday for the pageantry and pride of their annual parade, their beloved homeland could soon face a grave choice about its future relationship with the United States. The swirling celebration comes as the Caribbean island where the revelers trace their roots could soon face a once-in-a-lifetime choice between becoming the 51st state or an independent nation — or something in between. A recent breakthrough agreement has united both supporters and opponents of Puerto Rico statehood in the U.S. Congress behind a push by a D…
