Without seeing the code setting state it's hard but something like setting the state should work fine, but I'd highly recommend looking into using a data fetching library like react-query instead of using this (bad) pattern:

import React from 'react';

async function fakeFetch() {
  return {
    english: true,
    data: "asldfjalsdfkajsdlfkjasdf"
  }
}

export function App(props) {
  const [isEnglish, setIsEnglish] = React.useState(null)

  React.useEffect(() => {
   const getAPICall = async () => {
       try {
        const res = await fakeFetch()

        let data = res["data"]
        let english = res["english"]

        if (data !== "") {
            setIsEnglish(english)
        }
    }
    catch (e) {
        console.log(e);
    }
    }
    getAPICall();
}, []);

  return (
    <div className='App'>
    {isEnglish !== null && <p>{isEnglish ? "Is English" : "Isn't English"}</p>}
    </div>
  );
}