Question

how did the use of iron in transport and walfare help in the progress of civilization after the Bronze Age
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Answer 1

Ferrous metallurgy led to production of carbon steel.

When carbon steel became popular, it became easier to produce weapons and wheels in large quantities.

Mass production of weapons like swords, arrows etc increased war expenditure.

Invention of the iron wheel led to the use of bullock carts and horse driven carts for travel.