You guys realize there is a lot more required to become a US citizen than passing this test, right?
Yes, it's astoundingly easy. This is designed to be absolute basic stuff that one must know about this country in order to live here. Let alone, you grew up in an American education system where this stuff is taught very young and keep up with news where it's still relevant today. You'd probably have a bit more difficult of time answering equivalents to these questions for some other foreign nation. But I digress.
You don't even get to take this test until you've been one of 12.5 million a year who apply for an immigration visa (if you're a resident of one of the select eligible countries), been selected as one of the 55,000 a year (less than 0.01% of those who apply) to get picked, spent about 7 grand on an immigration lawyer to guide you through the process, fill out the proper forms, then work consistently without switching jobs for a vague amount of time that is at minimum 5 years but can last decades, unless you marry in, which takes more like three years.
That's all to get your green card. THEN you can start applying for citizenship.
I'm not saying everyone who wants to live here should be able to live here. But the immigration situation is one big cluster fuck as it is and is in desperate need of reform. The answer is not to throw your hands up and say "Well, whatcha gonna do, it's impossible to get here the right way, so might as well have complete anarchy and enforce no border laws." But it's not to leave it the way it is either.
All that to say, this test is easy because it's supposed to be. Passing it is not even 1% of 1% of the difficulty of becoming a citizen.