“Spatial Development of Russia and the USA in the 16-20th Centuries As Formation of the Major Unit of Geopolitical Constructs of Modernity”. Revista San Gregorio 1, no. 37 (April 4, 2020). Accessed December 28, 2025. http://revista.sangregorio.edu.ec/index.php/REVISTASANGREGORIO/article/view/1288.