I try to show some data by dropdown option from mySQL

when the user choose option United states and click submit, the page will go to the next page and show the data only for United states

here is my code for test.html
PHP Code:
<body>
    <
form action="showDB.php" method="post">
    <
table border="0">
    <
tr>
        <
th>test</th>
    </
tr>
    <
tr>
        <
td>Select Foreign Agent Country</td>
        <
td></td>
        <
td>
        <
select>
        <
option name="country" value="US">United States</option>
        <
option name="country" value="AUD">Australia</option>
        </
select
        </
td>
      </
tr>
        <
td>
        <
button type="submit" name="btn_submit"><a href="showDB.php">Click</a></button>
        </
td>
    </
table>
    </
form>

</
body
here is my second page showDB.php

PHP Code:
<?php
//connect to server
$connect mysql_connect("localhost""root""");

//connect to database
//select the database
mysql_select_db("asdasd");

//query the database
$query mysql_query("SELECT * FROM auip_wipo_sample");
if(
$_POST['country'] == 'US') {  
    
// query to get all US records  
    
$query mysql_query("SELECT * FROM auip_wipo_sample WHERE wipo_applicant1_country='US'");  
}  
elseif(
$_POST['country'] == 'AUD') {  
    
// query to get all AUD records  
    
$query mysql_query("SELECT * FROM auip_wipo_sample WHERE wipo_applicant1_country='JP'");  
} else {  
    
// query to get all records  
    
$query mysql_query("SELECT * FROM auip_wipo_sample");  
}  
//fetch the result
Print "<table border cellpadding=3>"
while(
$row mysql_fetch_array($query))
{
    Print 
"<tr>"
    Print 
"<th>high:</th> <td>".$row['invention_title'] . "</td> "
    Print 
"<th>lower:</th> <td>".$row['invention-title'] . " </td></tr>"
}
Print 
"</table>";
?>
however, I got 2 error

Notice: Undefined index: country in C:\xampp\htdocs\fak_ict1999\showDB.php on line 11
and line 11 is
Code:
if($_POST['country'] == 'US') {
Notice: Undefined index: country in C:\xampp\htdocs\fak_ict1999\showDB.php on line 15
and line 15 is
Code:
elseif($_POST['country'] == 'AUD') {
anyone can solve this??
thanks