How did these planks of the republican platform promote the industrial and commercial growth of the country

Republican economic policies are a focal point on what is good for businesses and investors. They are of the view that flourishing companies will boost economic growth for everyone.  

Explanation:

The Republican Party's traditionalist policies engage in support for free-market capitalism, free enterprise, creating a good business environment that intern boosts the growth of the country. They have a good national defense policy which will focus on primary security of US citizen.  

They want to protect the exploitation of labor so they advocated labor laws pertaining to present working conditions. They are concerned with various social issues namely abortion, the Equal Rights Amendment, same-sex marriage, and traditional values, usually with a Christian foundation.

what are the issues?

the reform movements that arose during the antebellum period in america focused on specific issues: temperance, abolishing imprisonment for debt, pacifism, antislavery, abolishing capital punishment, amelioration of prison conditions (with prison's purpose reconceived as rehabilitation rather than punishment), the humane treatment of animals, the humane and just treatment of native americans, the establishment of public institutions for the care of the destitute, orphans, blind, and mentally ill, the establishment of public schools, the abolition of tobacco use, vegetarianism, health reform, homeopathic medicine, woman's rights (including, at first, especially the establishment of a woman's right to own property apart from her husband and her right to sue for divorce), and the amelioration of labor conditions (including higher pay, the right to form unions, the right to strike, and the demand for limits on the number of work hours, and safe working conditions).

explanation: