By forming trade blocs United States and other nations primarily cooperate economically
<span>In 1917, Germany, determined to win its war of
attrition against the Allies, announced the resumption of unrestricted
warfare in war-zone waters. Three days later, the United States broke diplomatic relations with Germany, and just hours after that the American liner Housatonic was sunk by a German U-boat.</span>
The three principal ways civilization spreads from one region to another is through trade, travel and warfare. When people travel, they bring with them goods from their region to another and this would be the start of contributing and sharing, and trading their ways and ideas of growing crops and raising other goods. It can also be spread through wars. Through this, different relationships emerged. Hope this answer helps.
plz mark brainliest
The Answer Is:
(A.) "Their success encouraged people to experiment and invent new products"
