What is the MOST important effect of the discovery of rubber?

The first serious accounts of rubber production and the primitive native Americans system manufacture were given in the 18th century by “Charles Marie de la condamine ,A member of a French geographic expedition sent to south America in 1735.La Condamine described “caoutchouc “(the French spelling of native term for( “weeping wood”)as the condensed juice of the hevea tree, and in 1736 he sent rubber samples to Europe.initially the new material was merely a scientific couriosity .come years later British scientist (Joseph Priestley )remarked on its usefulness for rubbing pencil marks from paper ,and so the popular term rubber was coined .other applications gradually developed,notably for waterproofing shoes and clothing .

Explanation:

d) iowa i believe is the answer