19THAND 20THCENTURYIn these periods happened two of the major wars in the whole world, this led topositive events, such as the United Nations, world trade centers, connection of theworld, peace treaties, etc.Before the ww1 began the world was having economic problems and fighting forterritory in Europe and America, and some countries had already made allianceslike the Triple Alliance (Germany, Austria, and Ottoman Empire.) and the TripleEntente (France, Russia, and Great Britain), this meant that something big wasgoing to happen so they were getting ready.The First World War served as the stage for the debut of the new war technology.Among the new technology, were planes and submarines, which permitted the riseof aerial warfare and the sophistication of sea battles, also the introduction of tanks
