Displaying Portfolio Filter by Category Order (alphabetically)

I am assuming that ‘country’ is a custom meta field. In that case, you need this (very much like one of the examples in the Codex):

$loop = new WP_Query( 
    array ( 
        'post_type' => 'europe', 
        'posts_per_page' => -1,
        'orderby' => 'meta_value', 
        'meta_key' => 'country' 
        'order' => 'asc'
    ) 
);

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