Because legislating marriage is a right reserved to the states. If it's not an enumerated constitutional power, Congress has no authority to pass a law.*
(*nb: The Defense of Marriage Act (DOMA), which does define marriage as a union between "a" man and "a" woman, applies only to areas in which the federal government has authority to provide benefits (ie, Immigration, income tax breaks, social security benefits, etc.) to married people. It's sort of a defacto federal anti-polygamy law, though that's not its intended purpose.)
Polygamy is illegal everywhere in the United States due to a federal law. The individual punishment and definition of bigamy or polygamy in Nebraska can be defined by the state.
By federal law, yes. Federal law prohibits "Undocumented immigrants."
The practice of polygamy is illegal and a punishable criminal offense in all 50 states.
No. Polygamy is illegal in the United States and has been since the 1860's. In Utah, just cohabiting with more than one person you are not legally related to is a felony punishable by several years in prison.
None. FEDERAL law prohibits it.
The U.S. Constitution does not restrict the practice of polygamy. However, it does not explicitly or implicitly protect that right, which allows state and national legislatures to restrict it.--Polygamy is not mentioned in the constitution or in any of its amendments; the only prominent sect in the US that practiced polygamy (the Latter Day Saints) was established decades after the constitution was ratified. Polygamy is, however, against federal law.
I believe you're looking for antitrust laws
Unlikely. Federal law prohibits felons from possessing a firearm.
In the United States, the Americans With Disabilities Act of 1990 (ADA) is the leading federal law that prohibits discrimination against disabled individuals. Also, in terms of employment discrimination against federal sector employees, the Rehabilitation Act of 1973 prohibits unfavorable treatment of disabled employees.
Federal law prohibits federal funds including Medicaid funds, from being used to pay for an elective abortion
The Posse Comitatus Act prohibits Federal military personnel from acting as law enforcement officials in the US. The law was passed on June 18,1878 and updated in 1981.
The Posse Comitatus Act prohibits Federal military personnel from acting as law enforcement officials in the US. The law was passed on June 18,1878 and updated in 1981.