Which innovative feature was FIRST implemented in the USA.gov platform that significantly transformed how citizens access government services online?

Government digital services have evolved significantly over the past decade. These platforms serve millions of citizens daily, handling everything from tax filings to benefit applications. This trivia tests your knowledge about the development, implementation, and impact of government e-commerce platforms that have revolutionized citizen-government interactions. Do you know what goes on behind the scenes of these massive digital transformation projects?

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AI-powered virtual assistant that could answer citizens' questions across multiple government departments (2015)
Blockchain-based identity verification system for secure access to government services (2017)
Unified payment gateway for all federal government services and fees (2016)
Personalized citizen dashboard with cross-agency notification system (2018)