Which of the following inventions of the 1950s made other inventions possible?

You didn't give us choices, but I suspect the answer you're looking for is:

the transistor

John Bardeen, Walter Brattain, and William Shockley were awarded the Nobel Prize in Physics in 1956 for the invention of the transistor. (It might be noted, however, that there was some friction between Schockley and the other two members of the Bell Labs' team, Brattain and Bardeen.) A 2007 article in Computerworld magazine calls the transistor "the single most important invention of the 20th century." In addition to its early uses, making transistor radios and car radios possible, transistors have become the key component to all types of electronic devices. The transistor also functioned as "the building block for the processor," according to Computerworld.

america opposed the axis powers, because they knew that the united states would be targeted during the war. not only that, but germany (which was an axis power) broke the treaty of versailles, and started developing an army, and started attacking and taking over countries. furthermore, japan, which was allied with germany and italy (who both were axis powers) was attacking china, which was a great ally to the united states.

adopted the practice of proskynesis, a persian court custom that involved bowing down and kissing the hand of others, depending on their rank.