Final answer:
The political, economic, and technological changes during the presidencies of Reagan, George H.W. Bush, Clinton, George W. Bush, and Obama were significant and varied.
Step-by-step explanation:
The presidencies of Reagan, George H.W. Bush, Clinton, George W. Bush, and Obama were each marked by significant political, economic, and technological changes.
Under Reagan, there was a shift towards conservative policies, known as the "Reagan Revolution", which included tax cuts, deregulation, and increased military spending.
During George H.W. Bush's presidency, there was a focus on fiscal responsibility and building a coalition for the Gulf War.
Clinton's presidency saw a move towards a more moderate approach, including welfare reform and economic growth.
Under George W. Bush, there were significant political and economic events, including the 9/11 terrorist attacks and the subsequent wars in Afghanistan and Iraq.
Obama's presidency was marked by efforts to rebuild the economy after the 2008 financial crisis, the passage of the Affordable Care Act, and advancements in technology such as the rise of social media.