Answer:
Slavery was prohibited in states north of the 36°36', and this line continued west until California, which was completely admitted to the Union as a free state. In turn, slavery was allowed beneath the line. Missouri, on the other hand, was allowed into the Union as a slave state. This allowed for the amount of slave and free states to stay balanced to preserve the status quo in Congress.
Argentina, Belgium, Bolivia, Brazil, British Empire, Chile, Republic of China, Colombia, <span><span /><span><span><span> United Kingdom,</span><span> Australia,</span><span> Canada</span><span>, India,</span><span> New Zealand</span><span>, South Africa</span></span>,
</span><span /><span /><span> Cuba</span><span>, Czechoslovakia, Germany,</span><span> Denmark</span><span>, El Salvador, </span><span>France, </span><span>Greece</span><span>, Guatemala,</span><span>Haiti,</span><span> Honduras,</span><span> Kingdom of Italy, </span><span> Empire of Japan, </span><span> Liberia,</span><span> Netherlands,</span><span> Nicaragua,</span><span> Norway,</span><span> Panama,</span><span> Paraguay, </span><span> Persia,</span><span> Peru,</span><span> Poland,</span><span> Portugal</span><span>, Romania, </span><span> Siam aka Thailand, </span><span> Spain,</span><span> Sweden,</span><span> Switzerland,</span><span> Uruguay</span><span>, Venezuela,</span></span><span><span> Austria,</span><span> Bulgaria, </span><span>Costa Rica, </span><span> Finland, </span><span> Luxembourg,</span><span> Albania, </span></span>
They contributed to World War 1 through the assassination of Archduke Franz Ferdinand. The Black Hand was part of a Pan-Slavist movement in which they wanted to unite territories of South Slave that had been annexed by Austria-Hungry. Hopefully this helps.
If you would have lived in Greece in about 300BC, you could have witnessed The battle of Thermopyle
