What time frame that changed liberalism?

The time frame that significantly changed liberalism can be traced to the late 20th century, particularly the 1970s and 1980s. This period saw the rise of neoliberalism, which emphasized free markets, deregulation, and reduced government intervention in the economy, challenging the more welfare-oriented aspects of traditional liberalism. Influential figures like Margaret Thatcher and Ronald Reagan championed these ideas, leading to a shift in liberal thought towards prioritizing individual entrepreneurship and market solutions over collective welfare. This transformation has had lasting impacts on political and economic policies worldwide.