The "American System for Sustainable Immigration and Mass Immigration Limitations Achieved Through Imposing Oversight Nationally Act," or the ASSIMILATION Act, aims to fundamentally reshape the United States immigration system. Its primary purpose is to establish a universal national-interest standard , ensuring that all visa issuances, admissions, and adjustments of status affirmatively further the economic prosperity, cultural cohesion, and national security of the United States. This standard replaces the existing framework, moving away from family-chain and lottery-based admissions towards a merit-based system that prioritizes economic self-sufficiency, cultural assimilation, and the protection of U.S. workers. The bill significantly reforms family-sponsored immigration by redefining "immediate relatives" to include only spouses and unmarried children under 18 of U.S. citizens, thereby eliminating categories for parents and older children. It also reduces the worldwide level of family-sponsored immigrants and modifies preference classifications to only spouses and children under 18 of lawful permanent residents. Furthermore, the legislation completely eliminates the Diversity Immigrant Visa category , with provisions ensuring that prior selections are no longer valid. A new nonimmigrant visa (W) is created for parents of U.S. citizens, but these individuals are ineligible for employment or public benefits and require financial sponsorship and health insurance. For employment-based immigration , the bill sets a worldwide level of 140,000 visas and introduces a new national interest certification process. This process requires aliens to meet specific presumptive positive factors, such as high compensation, employment in a National Interest Occupation, strategic federal support, extraordinary ability, or entrepreneurship/innovation, while rebutting presumptive negative factors like sub-median compensation or limited English proficiency. The legislation also enacts substantial H-1B visa reforms , including a requirement for wages to be at least 200% of the median wage for the occupation, a cap of 50,000 visas annually, and a limitation of H-1B status to a non-renewable three-year period, with a two-year out-of-country requirement before status adjustment. The bill eliminates Optional Practical Training (OPT) for F-1 nonimmigrants unless explicitly authorized by statute. It also strengthens public charge inadmissibility standards , requiring aliens to demonstrate the ability to support themselves and their dependents without relying on means-tested public benefits. A presumption of public charge arises if an alien receives such benefits for more than 12 months within a 36-month period, making them deportable or subject to rescission of status. To bolster financial responsibility, the bill increases the income requirement for sponsors from 125% to 200% of the poverty line and mandates a $20,000 bond for each sponsored alien, enforceable for up to ten years. New provisions address visa overstays , making them a criminal offense with fines and imprisonment, and voiding nonimmigrant visas after 10 days of unauthorized stay or noncompliance. The bill significantly restricts parole authority to case-by-case urgent humanitarian or public benefit reasons for a maximum of 90 days, prohibiting categorical or programmatic use. It also limits enforcement discretion , preventing policies that exempt classes of aliens from immigration enforcement. For naturalization , the bill expands statutory bars to good moral character, increases the general residence requirement to 10 years, raises English proficiency standards, and mandates tax compliance and civic integration. Finally, it clarifies citizenship at birth , stating that a person born in the U.S. is "subject to the jurisdiction thereof" only if at least one parent was a U.S. citizen, national, or lawful permanent resident at the time of birth. Reforms to asylum procedures include establishing a "safe third country" and "transit bar" for eligibility, eliminating employment authorization based solely on a pending asylum application, and imposing a $500 filing fee. The "credible fear" standard for expedited removal is raised to "more likely than not" establish eligibility. The bill also revises rules for family detention , clarifying that it is governed by the Immigration and Nationality Act and preempting state licensing requirements for such facilities. For unaccompanied alien children , it streamlines repatriation for those from contiguous countries and tightens requirements for sponsor placement. Lastly, the legislation mandates the use of E-Verify for all new hires and revises the H-2A wage methodology to protect U.S. workers.