5.
His advocacy of protection to domestic manufactures, and of a judicious system of internal improvements.
In regard to internal improvements by the General Government, there was a difference of opinion between Mr.Adams and President Monroe.

The latter was strongly impressed with the beneficial tendency of a well-digested system of internal improvements; but he believed the constitution conferred no power on Congress to make appropriations for such a purpose.
It was in this view of the subject that he vetoed a bill which assumed the right to adopt and execute such a system, passed by Congress during the session of 1820-21.

But anxious that internal improvements, confined to great national purposes, and with proper limitations, should be prosecuted, he suggested that an amendment of the constitution to that effect should be recommended to the several States.
Mr.Adams, however, had no doubts that Congress already possessed a constitutional power to prosecute such internal improvements as were of a national character, and calculated to benefit the Union, and to levy duties for the protection of domestic manufactures.

During his entire political career he had deemed these to be two great points toward which the American Government and people should turn their especial attention; and he ever gave them his faithful advocacy and support.

With consummate wisdom, he foresaw that the more completely our internal resources were developed, and the less dependent we were on foreign powers, the greater would be our public and private prosperity.