Act of Congress

An act of Congress (or Act of Congress) is a statute enacted by government with a legislature named "Congress," such as the United States and the Philippines.

In the United States, acts of Congress are designated as either public laws, relating to the general public, or private laws, relating to specific institutions or individuals. Since 1957, all acts of Congress have been designated as "Public Law X-Y" or "Private Law X-Y," where X is the number of the Congress and Y refers to the sequential order of the bill (when it was enacted). For example, P. L. 111-5 (American Recovery and Reinvestment Act of 2009) was the fifth enacted public law of the 111th United States Congress.

Usage
The word "act", as used in the term "act of Congress", is a common, not a proper noun, and therefore should not be capitalized. Despite deprecation by dictionaries and usage authorities, some writers capitalize "act". This is likely a result of the more liberal use of capital letters in legal contexts, which has its roots in the 18th century capitalization of all nouns as is seen in the United States Constitution.

"Act of Congress" is sometimes used in informal speech to indicate something for which getting permission is burdensome. For example, "It takes an act of Congress to get a building permit in this town".

Promulgation (United States)
An act adopted by simple majorities in both houses of Congress is promulgated, or given the force of law, in one of the following ways:
 * 1) Signature by the President of the United States,
 * 2) Inaction by the President after ten days from reception (excluding Sundays) while the Congress is in session, or
 * 3) Reconsideration by the Congress after a presidential veto during its session. (A bill must receive a 2/3 majority vote in both houses to override a president's veto).

The President promulgates acts of Congress made by the first two methods. If an act is made by the third method, the presiding officer of the house that last reconsidered the act promulgates it.

Under the United States Constitution, if the President does not return a bill or resolution to Congress with objections before the time limit expires, then the bill automatically becomes an act; however, if the Congress is adjourned at the end of this period, then the bill dies and cannot be reconsidered (see pocket veto). In addition, if the President rejects a bill or resolution while the Congress is in session, a two-thirds vote of both houses of the Congress is needed for reconsideration to be successful.

Promulgation in the sense of publishing and proclaiming the law is accomplished by the President, or the relevant presiding officer in the case of an overridden veto, delivering the act to the Archivist of the United States. After the Archivist receives the act, he or she provides for its publication as a slip law and in the United States Statutes at Large. Thereafter, the changes are published in the United States Code.

An act of Congress that violates the Constitution may be declared unconstitutional by the courts. The judicial declaration of an act's unconstitutionality does not remove the law from the statute books; rather, it prevents the law from being enforced. However, future publications of the act are generally annotated with warnings indicating that the statute is no longer good law.