Answer:
25,000 Workers
Step-by-step explanation:
The blank will be filled with 25,000 Workers.
In 1800 s American and Britisher wanted to ship there good quickly so, they come up with an idea to construct a Canal.
But they were not able to come up with a solution so they were not able to move further than planning.
Then French come and they start building the canal but malaria and yellow fever spreader which cost the lives of 25,000 workers.
In 1903 USA comes in negotiation with the Colombian Army for the independence of Panama hence in 1903, Panama was declared independent.