The main principle of this country is limited government. Half of the items that you listed are not even under jurisdiction of the federal government.

main principle according to whom? what about freedom, democracy, justice...? you fail to realize, we are not the same country we were in 1776 - in every sense of the word. the items listed in my previous post, are examples of the numerous and continuous changes of the status quo - the things that have contributed to making this country great. if this country is to continue to prosper, it must sustain its tradition of change, innovation, and looking towards the future.

The main principle according to both the Declaration of Independence and the Constitution. The country is really based on one very simple principle: the national government has no power to ban child labor or to force people to wear seat belts or .... well, you get the idea.