Wildlife law is created by various levels of government within our federal system, from the national or federal level through states and local governments. With so many governing bodies, troubles can easily crop up. Different lawmaking bodies can pass laws that clash with one another. A law from one level of government might frustrate policies promoted by another. Plainly, housekeeping rules are called for, rules that explain what powers each government has and that resolve or avert direct and indirect conflicts. The rules that perform these functions are contained largely in the United States Constitution and in state equivalents. The Constitution, in addition, imposes limits on what all governments can do, designed to protect individual rights and property entitlements. In combination, these legal provisions supply an overall structure for wildlife law.