The Biden administration declared a reversal of Trump's policies, but observers believe that the United States has changed too much over the past four years.

As Donald Trump's term ends, many will probably remember him as the one-term president or the first president twice considered dismissed.

The response to Covid-19 was the biggest focus of the Trump administration's last year in term and also its biggest failure.

Inconsistent anti-epidemic messages and disregard for preventive measures such as wearing masks, social distance, and limited crowding have made the United States face overcrowding in hospitals and funeral homes.

The Trump administration's only victory was the rapid development of the Covid-19 vaccine, which was licensed for use in December of last year.

Before the pandemic, the opioid painkiller crisis was once a central public health problem for the Trump administration.

Many of Trump's other moves in the health sector also have a lasting impact on the lives of Americans, such as efforts to find ways to prevent abortion or to sign "the right to try" law, helping patients with diseases.

Immigration was considered one of the focus of Trump's election campaign in 2016, as well as during his four years at the White House.

Trump has drastically cut the number of asylum applications received and reviewed at the border on a daily basis and enacted the Migrant Protection Process (MPP), which forces asylum seekers to wait on the ground.

Some of the Trump administration's other attempts to restrict immigrants have been dismissed by courts, such as bringing immigration questions into the census and canceling the Action Program to delay deportation of illegal immigrants in.

He also used the Covid-19 epidemic as a reason to expel tens of thousands of migrants, freeze visas and restrict new green cards.

Biden is expected to reverse these immigration policies by Trump on the first day of inauguration, but observers say this may be "easier said than done".

The economy is considered to be Trump's strength thanks to his background as a businessman and a famous billionaire.

Unemployment in the US in 2019 fell to its lowest level since 1969, but that was before the Covid-19 pandemic struck and shook the economy, sending tens of millions of people out of work.

With a trade policy labeled "America first", Trump also withdrew the US from many international cooperation agreements such as the Trans-Pacific Partnership (TPP).

Trump's tariffs have cost American businesses and consumers tens of billions of dollars in damage.

In addition, to fulfill his promise to "revive" the US manufacturing industry, Trump also has many decisions to prevent US companies from transferring production lines abroad.

Of the policy legacies under Trump, his judicial appointments are promised to have the most lasting impact.

Trump also issued amnesty and reduced sentences to a series of allies, friends and acquaintances, before considering the other American's applications for concessions.

The Trump administration in July 2019 announced the restoration of the federal death penalty.

However, during his four years at the White House, Trump often came out about his lack of trust in the US judicial system, especially during his campaign to challenge Joe Biden's election results in courts.

Trump's defense strategy has been appreciated for his efforts to withdraw the United States from wars abroad.

One of the most memorable events of Trump's term was the October 2019 raid that killed the leader of the Islamic State (IS) rebel group Abu Bakr al-Baghdadi, the most wanted terrorist.

Another influential policy of the Trump administration is to ban transgender people from serving the military.

Trump's diplomatic strategy is dominated by his belief that the United States is being used by other countries, including its allies.

In addition, Trump's policy legacy has also been controversial in other areas such as education, energy, the environment or social security networks.

This is one of many national agreements that the US unilaterally withdrew during Trump's tenure as he pursued the "America First" pledge.

"Trump's 'America First' is 'America Alone'," said Brian McKeon, Biden's foreign policy advisor.