The 20th century had the Interstate Highway System, let the 21st see a national network of high speed rail!
Create a funding source (energy taxes? US Savings Bonds sold to citizens? Crowdfunding shares in a newly chartered corporation?) and a multi-decade plan.
Build 220-mph trunk lines with nonstop expresses between major cities and high speed regional service for other places in between. Link up to less populated areas with 110-mph service.
Proposed map at https://sites.google.com/site/californiarailmap/us-high-speed-rail-system