The Iron Curtain included Czechoslovakia<span>, </span>Bulgaria<span>, </span>Hungary<span>, </span>East Germany,Romania<span>, </span>Poland<span> and </span>Albania<span>. The Iron Curtain symbolized the political separation between Soviet-controlled and nonSoviet areas in Europe, which set the stage for the Cold War</span>
The geographic factor was actually their location.
The main way in which the development of the steam locomotive was so important to industrialization is that it allowed for steam to be used in factories that could use the steam power to run engines that could assemble products and create textiles with unprecedented speed.