I figured out why Trump is invading Portland

[taxi]

3. And some with tears in their eyes were saying,

Sir, you are going to need the best concrete you can get for the ballroom. The contractors are intent on using portland cement for the slab and we cannot allow the very base of your monument to be from a terrible place like Portland. You're going to have to take over the city.

Portland cement is the product obtained by pulverizing clinker, consisting of hydraulic calcium silicates to which some calcium sulfate has usually been provided as an interground addition. When first made and used in the early 19th century in England, it was termed portland cement because its hydration product resembled a building stone from the Isle of Portland off the British coast. The first patent for portland cement was obtained in 1824 by Joseph Aspdin, an English mason.

https://www.concrete.org/frequentlyaskedquestions.aspx?faqid=671