Assertion: ore's iron | /r/HasProperty | the material of choice
Facets:
value: by 300 bc
type: TEMPORAL
value: for most tools
type: OTHER
value: for weapons
type: PURPOSE
value: throughout china
type: LOCATION
Source sentences:
text: In China, these iron working methods spread northward, and by 300 BC, iron was the material of choice throughout China for most tools and weapons.