Some nearly 7 decades after America’s founding 250 years ago, in 1845 the United States Naval Academy came into being on the banks of the Severn River and for the last 181 years has been playing a vital role preparing America’s future Navy and Marine Corps officers in Annapolis. In WBAL Radio’s “America 250” series spotlighting Maryland’s role in shaping our nation, WBAL’s Scott Wykoff reports from Annapolis on how the Naval Academy came-to-be i…