What factors led to more workers joining existing and newly founded unions during the Gilded Age

The byzantine empire weakened after asia minor

What did hiram rhodes revels argue for in the senate

Can someone answer these question about vasco de gama for me: when? (when did he started his travel)from where & to where? (from where he was and then where he went to)motives? (what was his motives for traveling)accomplishments & discoveries? i will give you 15 star for answering all of these, you so much.