Final answer:
During his presidency, Obama was able to pass significant legislation including the Affordable Care Act and economic stimulus packages. He also made environmental and military policy changes.
Step-by-step explanation:
During his presidency, Barack Obama was able to pass several important pieces of legislation due to his power and the support of his party. One of the most significant achievements was the passage of the Patient Protection and Affordable Care Act, also known as Obamacare. This legislation aimed to provide all Americans with access to affordable health insurance and to lower the costs of healthcare. In addition to healthcare, Obama also passed the American Recovery and Reinvestment Act, which provided nearly $800 billion to stimulate economic growth and create jobs during the economic recession. He also overseen the distribution of the TARP program's $7.77 trillion to stabilize the nation's banking system and authorized financial support for the struggling auto industry. Other notable accomplishments include raising fuel-efficiency standards for automobiles, implementing environmental regulations to reduce greenhouse gas emissions, and reducing the country's military commitments in Iraq and Afghanistan.