The answer is A) People began to apply Christian principles to the social ills of society.
The great awakening was the period where rapid and dramatic religious awakening in American religious history happened.
The lasting impact of the Second Great Awakening of the 19th Century in America is: (B) The Catholic Church weakened as Protestantism swept through the United States.
Thus, option (b) The Catholic Church weakened as Protestantism swept through the United States is correct.
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