<span>It made the League of Nations weak and ineffectual, because after World War I, the United States was the only country left with enough muscle to enforce the League's decisions.
Hope this helps!
-Payshence xoxo</span>
<span>The obligations of serfs were to work for lords and knights. Serfs lives were much more difficult than that of a lord or knight. Serfs didn't have freedoms like the lords and knights. Knights would sometimes serve the lord as well but could also be the lord of a castle. Serfs didn't have that option.</span>
Carnegie invested in the Frick Coke Company because the Frick Coke Company is his main supplier of coke coal.