React Get Checkbox Value : How to Get All Checked Checkbox Value in React Js

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8" />
</head>
<body>
    <div id="app"></div>
    <script src="https://unpkg.com/react@17.0.2/umd/react.development.js"></script>
    <script src="https://unpkg.com/react-dom@17.0.2/umd/react-dom.development.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/babel-standalone/6.26.0/babel.min.js"></script>

function App() {
            const [selectedItem, setSelectedItem] = useState('');

const handleCheckboxChange = (event) => {
                setSelectedItem(event.target.value);
            };

return (
                <div className="container">
                    <h3>React Js Get Checkbox selected item | single Select checkbox</h3>
                    <label>
                        <input
                            type="checkbox"
                            value="America"
                            checked={selectedItem === 'America'}
                            onChange={handleCheckboxChange}
                        />
                        America
                    </label>
                    <label>
                        <input
                            type="checkbox"
                            value="England"
                            checked={selectedItem === 'England'}
                            onChange={handleCheckboxChange}
                        />
                        England
                    </label>
                    <label>
                        <input
                            type="checkbox"
                            value="Russia"
                            checked={selectedItem === 'Russia'}
                            onChange={handleCheckboxChange}
                        />
                        Russia
                    </label>
                    <div>Selected Item: {selectedItem}</div>
                </div>
            );
        }

ReactDOM.render(<App />, document.getElementById("app"));
    </script>

.container {
            margin: 0 auto;
            width: 600px;
            text-align: center;
            box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.12), 0 2px 4px 0 rgba(0, 0, 0, 0.24);
            padding: 20px;
        }

h3 {
            text-align: center;
        }

label {
            display: flex;
            align-items: center;
            margin-bottom: 10px;
            cursor: pointer;
        }

input[type="checkbox"] {
            margin-right: 10px;
        }

input[type="checkbox"]:checked+span {
            font-weight: bold;
        }

div.selected-item {
            margin-top: 10px;
        }
    </style>
</body>

</html>