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The day of the United States Declaration of Independence – level 1
04-07-1776The United States Declaration of Independence is a special document. It...
The day of the United States Declaration of Independence – level 2
04-07-1776The United States Declaration of Independence is a special document from...
The day of the United States Declaration of Independence – level 3
04-07-1776The United States Declaration of Independence was adopted on July 4,...
The day Russia sold Alaska to the United States – level 1
30-03-1867Russians come to Alaska in 1741. They are interested in fur...
The day Russia sold Alaska to the United States – level 2
30-03-1867Russians arrived in Alaska in 1741. The Russians were interested mainly...
The day Russia sold Alaska to the United States – level 3
30-03-1867Russians arrived in Alaska in 1741. They established the first permanent...
The day GPS was fully operational – level 1
17-07-1995GPS is a system which gives information about your location on...
The day GPS was fully operational – level 2
17-07-1995The Global Positioning System (GPS) is a satellite system which gives...
The day GPS was fully operational – level 3
17-07-1995The Global Positioning System (GPS) is a satellite system that provides...
The day of the first atomic bomb explosion – level 1
16-07-1945On July 16, 1945, the United States does the first successful...
