How did boll weevil helped the war effort

I don't know about the war effort, but about the weevil itself, it was devastating for the economy, and therefore forced the US. to be less dependent on cotton and diversify their industry towards mixed farming and manufacturing.

The weevil was eradicated somewhere after 1978, so if the war that you're talking about was after that, than it would mean that the weevil made the US. economy more prepared for the war as they now had the better mixed farming and manufacturing processes already set up

european feudalism was a combination of legal and military customs in medieval europe that flourished between the 9th and 15th centuries. broadly defined, it was a way of structuring society around relationships derived from the holding of land in exchange for service or labour.

japanese feudalism. the era of feudalism in japan took place from the 12th through 19th centuries. during that period local rulers, either powerful families or military warlords, dominated the land, while the emperor was merely a figurehead and not a significant political presence.