Because when the natural rubber supply from Southeast Asia was cut off at the beginning of World War II, the United States and its allies faced the loss of a strategic material. <span> So the companies, in collaboration with a network of researchers in government, academic, and industrial laboratories, developed and manufactured in record time enough synthetic rubber to meet the needs of the U.S. and its allies during World War II.</span>
Adverbs modifies another word. And usually end in -ly but not all the time.
Sleepily
Really
Sweetly
Barely
Fully
Scarcely
Often
Hope this helps you!
Its most likely Production, factories “used” to be the American labor back then.
Environment
culture
physical and psychological
