Remember, diplomatic messages take 2-3 days to receive, international news take 1 day to spread throughout the globe, Germany annexed Austria and Czechoslovakia but only annexed Czech Republic and made Slovakia a puppet state. Each branches of research tree have a minimal research options of 2 and a maximal of 5. If chose to do so, user can research 5 branches all at once, but it can take 35-70 days to complete. Each rearmament tree includes actual historical units.