Morse defended the institution of [[slavery]], and was a leader in the anti-Catholic and anti-immigration movement. He thought that the Austrian government and Catholic aid organizations were subsidizing Catholic immigration to the United States in order to gain control of the country. | Morse defended the institution of [[slavery]], and was a leader in the anti-Catholic and anti-immigration movement. He thought that the Austrian government and Catholic aid organizations were subsidizing Catholic immigration to the United States in order to gain control of the country. |