Why didn’t the British attack the fort right away?

The attack on Fort McHenry in Baltimore's harbor was a pivotal moment in the War of 1812 as it successfully thwarted the Chesapeake Bay campaign the Royal Navy had been waging against the United States.

Coming only weeks after the burning of the U.S. Capitol and the White House by British forces, the victory at Fort McHenry, and the associated Battle of North Point, were much-needed boosts to the American war effort.

The bombardment of Fort McHenry also provided something no one could have anticipated: a witness to the "rockets red glare and bombs bursting in air," Francis Scott Key, wrote the words which became "The Star-Spangled Banner," the national anthem of the United States.

Explanation:

the second significant cause of the great migration was the desire of black southerners to escape segregation, known euphemistically as jim crow. rural african american southerners believed that segregation - and racism and prejudice against blacks - was significantly less intense in the north.