President Obama announced on Tuesday that the U.S. would extend the Afghanistan War, the longest in American history, an additional two-and-a-half years. What will that get us?

For most Americans, the answer is unclear. Despite polls saying that a majority of Americans think the Afghanistan War was a mistake and not worth the blood and treasure, the U.S. will leave 9,800 troops and an untold number of contractors in the country after the end of this year.

OUR VIEW: Obama’s risky Afghanistan exit

Economists estimate that the long-term costs of being at war in Afghanistan for nearly 13 years will exceed a few trillion dollars. That’s enough tax dollars to take care of all our woefully needed infrastructure investments through 2020. So why spend more taxpayer dollars on the Afghanistan War?

The president claims that we need the troops to continue training Afghan forces for stability and to continue our fight against terrorists such as al-Qaeda.

Yet, the surge of troops in 2009 and 2010 into the country failed to quell the violence, showing that large troop numbers neglect to lead to stability or lead to a democratic or even a well-governed Afghanistan. Historically, political solutions are the best solutions to produce stability, even if difficult to obtain.

Also, history teaches us that local policing, working with the local populace, is far more likely to reduce terrorists than foreign forces that may increase recruitment by killing innocents and arousing resentments.

In 2009, senior U.S. military intelligence officials claimed that fewer than 100 members of al-Qaeda remained in Afghanistan. In contrast, nearly 15,000 operate in Syria. And remember that Osama bin Laden was found in Pakistan, where experts think that al-Qaeda is led in the tribal regions.

While it’s unlikely that the Obama administration will change its mind on wasting two more years with a military presence in Afghanistan, Congress should take its war powers back and force the president to listen to Americans. Bring the troops home as soon and as safely as possible.

Paul Kawika Martin is the policy and political director for Peace Action — the nation’s largest grassroots peace group (www.Peace-Action.org). He traveled to Afghanistan in 2010.