Final answer:
The period of February 26 to March 17/18, 1921, in a historical context, does not refer to a specific event but is indicative of the broader post-war developments, marked by the aftermath of World War I, Russian Civil War, and a high volume of propaganda production, including posters and illustrated broadsheets.
Step-by-step explanation:
The content for the period of February 26 to March 17/18, 1921, in historical terms, would refer to a range of events and socio-political developments. The early 20th century was a formative time for modern nations and included significant political shifts, technological advancements, and cultural changes. Though there is no specific event mentioned for these exact dates, a broader context highlights the aftermath of World War I, the Russian Civil War, and the inter-war period leading up to World War II. In the same vein, during this era, the production of various forms of propaganda, including posters and illustrated broadsheets, was substantial as they accounted for nearly 20 percent of all publications following the end of World War I.
Looking at lubok pictures and the prevalence of propaganda and proclamations illuminates the importance of visual culture and mass communication in the early 20th century. Without a specific event or topic referenced for the February 26 to March 17/18, 1921 dates, one must consider the geopolitical landscape and societal factors that characterized the post-war period, influencing the arts, politics, and the rapidly shifting dynamics of countries worldwide.