<h1>Biden Warns of U.S. 'Oligarchy' as Tech Billionaires Join Trump's Administration, Raising Concerns Over Wealth Concentration.</h1> President Joe Biden has warned of the U.S. becoming an 'oligarchy' as Donald Trump prepares for his second-term inauguration, flanked by tech billionaires Elon Musk, Jeff Bezos, and Mark Zuckerberg. Musk, who contributed $200 million to Trump's campaign, will have a new role in reshaping government. The three billionaires, worth nearly $1 trillion combined, highlight the significant influence of the wealthy in the incoming administration. Despite efforts by Democrats to address wealth inequality, the wealthiest 0.1% of Americans own a substantial portion of the nation's wealth, raising concerns about the concentration of power among the elite.