To make it simple: these are technologies located on the left side of the achievement tree.
Why these improvements are so important?
Thanks to them, your country can develop quickly.
2.Science centers are the places that are most often attacked by the enemy soldiers.
For example: if you do not have access to the sea do not develop technologies connected with navy.
4.Muskets are the most important element of every land battle.
As a matter of fact you will need to improve these weapons.
The first thing is to grant them Ring Bayonets or Socket Bayonets, instead of Plug Bayonets.
Moreover you will need the Fire by Rank ability and Square Formation.
Do not forget about industry and agriculture - but there are no very important technologies.
5.To develop your technology very quickly you will need some agents (gentlemen).
Build some cultural or educational constructions (academies, observatories, etc.)
to grant yourself a stable access to very intelligent workers.
Deploy them in research centers to support the development.
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