The main purpose of the Natural Gas Export Expansion Act is to facilitate and promote the export of natural gas from the United States. The legislation aims to boost domestic natural gas production, which is expected to lead to job creation and overall economic growth. Key provisions of the Act include changes to the existing process for approving natural gas exports. It allows for an expedited application and approval process for exporting natural gas to countries not excluded by the law. The Act specifies that nations under U.S. sanctions will not be eligible for this expedited process.