install latest version
npm install react-router-dom

 
For v6 use below

import React, { Component } from 'react';
import Navbar from './Components/Navbar';
import News from './Components/News';

import { BrowserRouter as Router, Route, Routes } from 'react-router-dom'
export default class App extends Component {

  render() {
    return <div>
      <Router>
        < Navbar />
        <Routes>
            <Route exact path="/" element={<News pageSize={8} category="general"/>}/>
            <Route exact path="/business" element={<News pageSize={4} category="business"/>}/>
            <Route exact path="/entertainment" element={<News pageSize={4} category="entertainment"/>}/>
            <Route exact path="/general" element={<News pageSize={4} category="general"/>}/>
        </Routes>
      </Router>
    </div>;
  }
}