9 political cartoons by Dr. Seuss that are still relevant today.

The legendary children's author had some thoughts about 'America First.'

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Did you know that in addition to being a beloved author of children's books, Dr. Seuss wrote more than 400 political cartoons during World War II?

Theodor Seuss Geisel, better known as Dr. Seuss, gifted the world with stories like "The Cat in the Hat," "The Lorax," "Green Eggs and Ham," and dozens of other childhood classics until his death in 1991.

In recent years, however, it's some of his lesser known works from the 1940s that have gained attention.

Seuss reads from "Horton Hears a Who!" to 4-year-old Lucinda Bell in 1956. Photo via AP.

In the years leading up to World War II, Seuss began penning cartoons for PM, a liberal publication, frequently pushing back against the "America First" mentality of U.S. isolationists opposed to U.S. involvement in the war.

So when candidate Donald Trump adopted "Make America Great Again" as his campaign slogan, echoing cries of "America First" — the rallying call for an anti-Semitic and Nazi-appeasing segment of the wartime U.S. population — some of Seuss' cartoons began to find new relevance more than 70 years after first being published.

Like this one, which depicts a mother reading a book titled "Adolf the Wolf" to children while wearing an "America First" shirt, explaining that because the wolf's victims were foreign children, it didn't really matter that the wolf ate them — a clear parallel to the conflicting approaches to our modern refugee crisis.

"And the Wolf chewed up the children and spit out their bones ... but those were Foreign Children and it really didn't matter." Image dated Oct. 1, 1941, via Dr. Seuss Political Cartoons/Special Collection and Archives, UC San Diego Library.

Image dated Oct. 9, 1941, via Dr. Seuss Political Cartoons/Special Collection and Archives, UC San Diego Library.

"We Clams Can't Be Too Careful." Image dated July 17, 1941, via Dr. Seuss Political Cartoons/Special Collection and Archives, UC San Diego Library.

"The old Family bath tub is plenty safe for me!" Image dated May 27, 1941, via Dr. Seuss Political Cartoons/Special Collection and Archives, UC San Diego Library.

Suess's other comics took aim at overarching issues like anti-Semitism, racial inequality, and political obstructionism — all issues still relevant today.

To be sure, the comics were far from perfect and reflected some ugly stereotypes of their own. For instance, many of his cartoons amplified some pretty awful stereotypes of Japanese citizens and Japanese-Americans. And while it's easy to chalk that up as being simply an element of the time, that type of anti-Japanese sentiment helped fuel the racism and paranoia that eventually led to Japanese internment.

"Only God can make a tree to furnish sport for you and me!" Image dated July 20, 1942, via Dr. Seuss Political Cartoons/Special Collection and Archives, UC San Diego Library.

"Stop all U.S. progress." Image dated Oct. 24, 1941, via Dr. Seuss Political Cartoons/Special Collection and Archives, UC San Diego Library.

"The Guy Who Makes a Mock of Democracy." Image dated July 30, 1942, via Dr. Seuss Political Cartoons/Special Collection and Archives, UC San Diego Library.

"Relax, Sam, I assure you the express turns off right here!" Image dated Sept. 9, 1941, via Dr. Seuss Political Cartoons/Special Collection and Archives, UC San Diego Library.

If the world of Dr. Seuss can teach us anything, it's that history is our best defense against modern tyranny.

Well, that, and the fact that Americans will always love goofy hats:

"We Always Were Suckers for Ridiculous Hats." Image dated April 29, 1941, via Dr. Seuss Political Cartoons/Special Collection and Archives, UC San Diego Library.

See more of Seuss' wartime comics at the University of California San Diego Library's website.

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