Why is it Btc that controls the price of other cryptocurrencies in the market?

[Gposas]

How was it possible for btc to grow up to the level of controlling the market price of other cryptocurrencies and why is it Btc?
Was there no other crypto currency as at that time and what was controlling the price of the market as at then before the emergence of BTC?

[Ysquare25]

Because of its pioneering status, investors often consider Bitcoin as the reserve currency of the cryptocurrency market, similar to the USD in the global stock markets. As such, a large number of investors initially invest in Bitcoin to trade it for altcoins and try to make profits thereafter.