1. The 17th amendment (1912) - Electing senators by popular vote broke the state representation in the federal government. States no longer had representation to protect their sovereignty.
2. The federal reserve act (1913) - enables government to self-fund by printing money and enforces everyone onto a single, centrally controlled bank.
3. The 16th amendment (1913) - Federal income tax - allows the federal government to directly tax citizens for the first time.
Those three amendments, in effect, decimated the federal system and centralized power. After that, they could pass what ever they wanted.
IMO the internet is re-igniting a public debate and push towards populism -- that and that's why you saw the 2008 rise of Ron Paul, Occupy Wallstreet, Tea Party, Bernie Sandars and now MAGA.
(yes, it was coupled with a financial crisis, but the government response led to push back).