Expected behavior When I click on the NavItem with link to a page, I should be redirected to that page

Actual behavior Nothing happens lol

Resources (screenshots, code snippets etc.) My index.js is like that:

import App from "./App";
import Aboutus from "./pages/About"
import { BrowserRouter, Route, Switch } from 'react-router-dom';

import registerServiceWorker from './registerServiceWorker';

ReactDOM.render( <BrowserRouter>
    <Switch>
    <Route path="/" component={App} exact />
    <Route path="/About" component={Aboutus} exact />
    </Switch>
    </BrowserRouter>,
    document.getElementById('root'));

My navbar.js

import React, { Component } from "react";
import {
MDBNavbar, MDBNavbarBrand, MDBNavbarNav, MDBNavItem, MDBNavLink, MDBNavbarToggler, MDBCollapse, MDBFormInline,
MDBDropdown, MDBDropdownToggle, MDBDropdownMenu, MDBDropdownItem, MDBBtn
} from "mdbreact";
import { BrowserRouter as Router } from "react-router-dom";

class NavbarPage extends Component {
state = {
  isOpen: false
};

toggleCollapse = () => {
  this.setState({ isOpen: !this.state.isOpen });
}

render() {
  return (
    <Router>
      <MDBNavbar color="white" light expand="md">
        <MDBNavbarBrand>
          <strong>
          <img src={require('./logo-transparent-7.png')} width='125rem' />
          </strong>
        </MDBNavbarBrand>
        <MDBNavbarToggler onClick={this.toggleCollapse} />
        <MDBCollapse id="navbarCollapse3" isOpen={this.state.isOpen} navbar>
          <MDBNavbarNav left>
            <MDBNavItem>
              <MDBNavLink to="/">Home</MDBNavLink>
            </MDBNavItem>
            <MDBNavItem>
              <MDBNavLink to="/About">About</MDBNavLink>
            </MDBNavItem>
            <MDBNavItem>
              <MDBNavLink to="/Contact">Contact</MDBNavLink>
            </MDBNavItem>
          </MDBNavbarNav>
          <MDBNavbarNav right>
          <MDBBtn color="success">Donate</MDBBtn>
          </MDBNavbarNav>
        </MDBCollapse>
      </MDBNavbar>
    </Router>
    );
  }
}

export default NavbarPage;