进行一次语法和拼写检查，纠正下面这段文字的错误。


“Frederick Douglass was born into slavery on the Eastern Shore of Maryland in February 1818.  He made a daring escape to New York City in 1838, where he soon became involved in abolitionist politics. Many of his speeches about the subject, including his famous 'What to the Slave is the Fourth of July?' speech, is still remembered today."
"Frederick Douglass was born into slavery on the Eastern Shore of Maryland in February 1818. He made a daring escape to New York City in 1838, where he soon became involved in abolitionist politics. Many of his speeches about the subject, including his famous 'What to the Slave is the Fourth of July?' speech, are still remembered today." 

（将is改为are，使得谓语动词与主语 speeches 一致。）