The world sorted by their gross domestic product per capita<span> at nominal values. This is the value of all final goods and services produced within a </span>nation<span> in a given year, converted at market exchange rates to current U.S. dollars, divided by the average (or mid-year) population for the same year.
I'm not sure if this is what your lookng for.</span>
Airplanes were vital for ww1 to ease transport of amo and soon guns on the planes including bombs this made it easier for to launch quick air strikes on places like bases vulnerable to air strikes
Timbuktu was a place where ideas were shared and quickly became a center for learning.
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The reason the Balkans are a shatterbelt is because they for 1 dont like eachother and also they have many differrences and in polital views and they all have unstable riots and ecodimy and they have micronations that are sprouting up such as Kosovo Limberland so they are spliting up.
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