ISIS has also been the world's deadliest terrorist group for the 9th consecutive year as of 2023, so saying that Trump's policies defeated ISIS would be incorrect.
Pretty much everyone underestimated ISIS capabilities in the beginning.
In a television interview in January 2014, a few days after ISIS seized control of Fallujah, President Obama dismissed ISIS as being “the JV team.” Administration officials admitted that they did not focus sufficiently on ISIS’s territorial ambitions, instead viewing its activities as a response to the Iraqi government’s hostile policy toward Sunnis. Some were concerned primarily by the possibility that jihadists making their way back to Europe would then form terrorist cells on the continent, but were not worried about their efforts to control territories seized in Syria and Iraq. In hindsight, it is clear that both the intelligence community and the decision makers did not fully understand the implications of the crisis in Syria and Iraq for ISIS’s growth and methods of operation. They failed to realize that the vast vacuum created in both countries could not stay empty for long and that the central governments’ inability to govern large tracts of land was an open invitation to an organization such as ISIS to fill the vacuum, construct its force, and grow in strength, in order to seize control of the lawless regions.
The administration, security establishment, and intelligence community were all surprised by the rapid collapse of the Iraqi army. The army alone, not counting the police, was ten times the size of ISIS, and was constructed and trained by the United States over several years. Because most of its troops were Shiite, the expectation was that they would demonstrate both the will to fight and a reasonable level of resolve in battling a Sunni organization. This did not happen, and it was not understood that ethnic division in the Iraqi government, establishment, and security forces would impinge on the resolve of the army to defend the country. Its collapse within 48 hours and its inability to defend a large central city like Mosul were not foreseen, which raised questions about the possibility of ever reconstructing this force.
https://www.inss.org.il/wp-content/uploads/sites/2/systemfiles/adkan18_3ENG (4)_Kam.pdf (PDF)
The president doesn't decide how much military pay increases.
A: ECI is the Employment Cost Index, which is a measure of the increase in private-sector wages and salaries. It is calculated by the Department of Labor's Bureau of Labor Statistics and updated every three months. The ECI, reported each October, is used to determine the pay raise for the next fiscal year. The raise was set at ECI + 1/2% for 2000 through 2006. The FY2004 National Defense Authorization Act (NDAA) established that the military pay raise will be equal to ECI after 2006. Of course, Congress can enact raises that exceed these percentages as they did for 2008 and 2009.
Congress gives the final approval, and then the president signs it into law.
There have been military pay increases under both presidents that have exceeded the rate of inflation.
Pay inc. Left column
Inf. right column
President Trump
2018 - 2.4% 1.9%
2019 - 2.6% 2.3%
2020 - 3.1% 1.4%
2021 - 3.0% 7.0%
President Biden
2022 - 2.7% 6.5%
2023 - 4.6% 3.4%
2024 - 5.2% Current YOY rate of inflation 2.9%
2025 - 4.5%
“I started the process, All the troops are coming back home. They [the Biden administration] couldn’t stop the process. 21 years is enough. Don’t we think? 21 years. They couldn’t stop the process. They wanted to, but it was very tough to stop the process when other things… It’s a shame. 21 years, by a government that wouldn’t last. The only way they last is if we’re there. What are we going to say? We’ll stay for another 21 years, then we’ll stay for another 50. The whole thing is ridiculous. … We’re bringing troops back home from Afghanistan.” -- Donald Trump June 26, 2021
President Joe Biden and his predecessor, Donald Trump, were both eager to withdraw U.S. troops from Afghanistan and end what Biden referred to in his Aug. 16 speech as “America’s longest war.”
The Trump administration in February 2020 negotiated a withdrawal agreement with the Taliban that excluded the Afghan government, freed 5,000 imprisoned Taliban soldiers and set a date certain of May 1, 2021, for the final withdrawal.
And the Trump administration kept to the pact, reducing U.S. troop levels from about 13,000 to 2,500, even though the Taliban continued to attack Afghan government forces and welcomed al-Qaeda terrorists into the Taliban leadership.
Biden delayed the May 1 withdrawal date that he inherited. But ultimately his administration pushed ahead with a plan to withdraw by Aug. 31, despite obvious signs that the Taliban wasn’t complying with the agreement and had a stated goal to create an “Islamic government” in Afghanistan after the U.S. left, even if it meant it had to “continue our war to achieve our goal.”