The date is 1st of january 1939 in europe, the year where a second world war is about to start. Choose the nation you're leading, you can research various trees, such as:

• Industry tree
• Agricultural tree
• Technology tree
• Transportation tree
• Infrastructure tree
• Army rearmament tree
• Air force rearmament tree
• Naval rearmament tree
• Economical tree

These trees have branches on them which are options of the tree research, each branches takes at least 7-14 days of research to complete.