It's extremely difficult to reverse new taxes, even if the nominal purpose for which they were levied is long past.
"The Spanish-American War has been over for more than 100 years, and now so is the tax imposed in 1898 to help fund it.
As of Tuesday, all phone companies selling long-distance phone service are legally required to eliminate the 3 percent federal excise tax on long-distance service, which had been established in 1898 as a luxury tax on wealthy Americans who owned telephones."
https://www.cnet.com/tech/tech-industry/telecom-tax-imposed-in-1898-finally-ends/
"The Spanish-American War has been over for more than 100 years, and now so is the tax imposed in 1898 to help fund it.
As of Tuesday, all phone companies selling long-distance phone service are legally required to eliminate the 3 percent federal excise tax on long-distance service, which had been established in 1898 as a luxury tax on wealthy Americans who owned telephones."
https://www.cnet.com/tech/tech-industry/telecom-tax-imposed-in-1898-finally-ends/