If bitcoin rises or falls it pulls with itself a lot of altcoins too, simply because usually if you want to buy an altcoin you have to buy BTC 1st, so the two is not independent. Other reasons may be pump and dump strategies and things like that
It does make sense bro, but how about Ethereum? As I know they do have own blockchain which maybe not rely on the price of Bitcoin right? Here in our country, we have this wallet that able us to cash in fiat currency and convert it directly to Ethereum token but why is it also drops its price?