Why is the commerce clause written in 1787 still adequate to meet the needs of the nation in the 21st century?

The commerce clause written in 1787 states "[The Congress shall have power…] To regulate Commerce with foreign Nations, and among the several States, and with the Indian Tribes;"

The commerce clause ensures that everyone in doing trade has to abide by the rules and regulations made by congress for the good of all. It is applicable until this day because trade and business is still very much flourishing. Many laws were added to ensure equality among businesses; not only in the business practices but also for the betterment of their workers. 

Through the commerce clause, organized labor laws, child labor laws, trucking and transportation laws, possession of a gun near a grade school laws, work safety laws, environmental laws, financial laws, farming laws, manufacturing laws, drug laws, food laws, and public health laws were passed.

They feared germany was trying to develop nuclear weapons.