The former American diplomat had helped negotiate the Louisiana Purchase.

Entity and relation annotations:
id: 0
type: entity
value: text: American diplomat
labels: <Title>
id: 1
type: entity
value: text: the Louisiana Purchase
labels: <Event>
id: 2
type: entity
value: text: Louisiana
labels: <Location>
type: relation
to_id: 2
labels: Event:Occurs_at:Location
from_id: 1