wp_insert_post order drawback

I’m sorry, I converse just a little English.

My code in my customized theme (features.php) [only example]:

$posts = array(
'141th',
// ...
'third',
'2nd',
'1st'
);
foreach( $posts as $put up ) {
wp_insert_post( array( 'post_title'=> $put up ) );
}

My posts listing:

1
4
3
2
5
...
141

I would really like (so as):

1
2
3
4
5
...
141

Why? What’s the drawback and fixing?

Thanks.